Answers
The esophagus functions primarily as a transport tube that directs the progression of food and fluids from the mouth to the stomach.
Related Questions
Polar water molecules can surround ions, reducing the likelihood of them interacting with other ions. What property of water does this phenomenon cause?
Answers
The property of water that causes polar water molecules to surround ions, reducing the likelihood of them interacting with other ions, is known as its solvation or hydration ability.
This solvation property is a result of water's high polarity, which arises from its asymmetrical molecular structure and the presence of polar covalent bonds. Water molecules have a partially positive (+) and partially negative (-) end due to the electronegativity difference between oxygen and hydrogen atoms. This polarity enables water molecules to form hydrogen bonds with other water molecules and with polar solutes, such as ions. When ions dissolve in water, the partially positive hydrogen atoms of water molecules are attracted to the negatively charged ions, and the partially negative oxygen atoms of water molecules are attracted to the positively charged ions.
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How many grams are 5.83 moles of C2H2
Answers
3. Why would one solution absorb more light than the
other when they both had the same concentration?
Answers
Answer:
This is because the proportion of light that gets absorbed is affected by the number of molecules that it interacts with. Solutions that are more concentrated have a larger number of molecules that interact with the light that enters, thus increasing its absorbance. ... This increases the absorbance.
Explanation:
look ti up
One solution will absorb more light than the other when they both had the same concentration because of Molar Absorptivity, Electronic Transitions, Path Length , Wavelength of Light, Interactions with Solvent, and Presence of Other Species.
The absorption of light by a solution is influenced by various factors, including the concentration of the absorbing species, the path length of the light through the solution, the nature of the absorbing species, and the specific wavelengths of light being used. When two solutions have the same concentration but one absorbs more light than the other, it's likely due to differences in the nature of the absorbing species and their interactions with light.
Here are some reasons;
Molar Absorptivity (Molar Extinction Coefficient): Different substances have different molar absorptivities, which indicate how strongly a particular substance absorbs light at a specific wavelength. Even at the same concentration, one substance might have a higher molar absorptivity than the other, leading to greater light absorption.
Electronic Transitions: Absorption of light often involves electronic transitions in molecules. If one solution has more molecules capable of undergoing the specific electronic transition responsible for light absorption, it will absorb more light.
Path Length and Absorption Cell: The length of the path that light travels through the solution can impact the amount of light absorbed. If the two solutions are measured in different absorption cells with varying path lengths, this can lead to different light absorption even with the same concentration.
Wavelength of Light: The wavelength of light used for measurement can affect the absorption. Some substances may have stronger absorption at certain wavelengths, so using different wavelengths might result in different absorption behaviors.
Interactions with Solvent: The solvent in which the absorbing species is dissolved can influence its absorption properties. Solvent effects such as polarity and hydrogen bonding can alter the electronic transitions and, consequently, the absorption behavior.
Presence of Other Species: Other substances present in the solution might interact with the absorbing species, affecting its absorption characteristics. This is particularly relevant if the absorbing species can form complexes or undergo reactions with other components.
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Nuclei with an even number of protons and an even number of neutrons are more stable than those with an odd number of protons and/or an odd number neutrons. What is the significance of the even number of protons and neutrons in this case?
Answers
The significance of the even number of protons and neutrons, in this case, is that it gives stability to the nucleus of an atom.
What are protons are neurons?Protons are the positively-charged sub-atomic particle found in the nucleus of an atom. Protons are responsible for the mass of the atom of an element.
Protons exert a positive attractive force on the electrons found in orbitals around the atom.
Neutrons are neutral particles that are found together with the protons in the nucleus of an atom.
Neutrons together with protons account for the mass of an atom. Although neutrons are neutral, they contribute to the strong nuclear force that holds the nucleus of an atom together.
The correct ratio of protons and neutrons in the nucleus of an atom is required for the stability of the nucleus of an atom.
When the ratio of the protons and neutrons increases above 1 : 1.5, the nucleus of the atom becomes unstable.
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HELPPPP FASTTTTTTT
An inflated balloon is left outside overnight. It has a volume of 1.7 4 L when the temperature is 20.2 degC and the pressure is 1.02 atm. At what temperature will the balloon have a volume of 1.56 L if the pressure falls to 0.980 atm?
What gas law will you use to solve this problem?
options
A. boyles gas law
B. charles gas law
C. Gay lussacs gas law
D. combined gas law
E. ideal gas law
What is your reason for choosing the gas law?
options
A.moles are in the problem
B. there are 2 variables that are changing
C. there are 3 variables that are changing
In this problem, is the volume increasing or decreasing?
What is the unknown that you are solving for?
options.
A.T1
B.T2
What temperature will you use in your calculations?
A. 20.2 degc
B. 273 k
C. 293.2 K
What is the final temperature after the volume and pressure decrease in this problem?
options.
A. 253k
B. 314k
C. 353 K
Answers
Explanation:
1.The gas law that we will use to solve this problem is the combined gas law.
2.We will choose the combined gas law because there are three variables that are changing in this problem: volume, pressure, and temperature.
3The volume is decreasing in this problem, from 1.74 L to 1.56 L.
The unknown that we are solving for is T2, the temperature at which the balloon will have a volume of 1.56 L.
4We will use the temperature in Kelvin for our calculations. To convert from Celsius to Kelvin, we add 273.15 to the Celsius temperature. Therefore, the temperature we will use in our calculations is 293.35 K (20.2°C + 273.15).
5To find the final temperature, we can use the combined gas law equation:
(P1 x V1)/T1 = (P2 x V2)/T2
where P1 = 1.02 atm, V1 = 1.74 L, T1 = 293.35 K, P2 = 0.980 atm, and V2 = 1.56 L.
Substituting the values into the equation and solving for T2, we get:
T2 = (P2 x V2 x T1)/(P1 x V1)
= (0.980 atm x 1.56 L x 293.35 K)/(1.02 atm x 1.74 L)
= 268.06 K
Therefore, the final temperature after the volume and pressure decrease is 268.06 K, which is approximately 253 K (option A).
871g of sodium chloride is how many moles
Answers
Answer:
14.9 mol
Explanation:
To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.
871 g × (1 mol / 58.44 g)
= 871/58.44 mol
≈ 14.9 mol
Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.
Milk of magnesia, which is an aqueous suspension of magnesium hydroxide, is used as an antacid in the reaction below. How many molecules of HCl would have to be present to form 34.52 g of MgCl₂?
Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)
Answers
Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.
To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:
Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)
The molar mass of MgCl₂ is 95.21 g/mol.
First, we need to calculate the number of moles of MgCl₂ formed:
Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂
Moles of MgCl₂ = 34.52 g / 95.21 g/mol
Moles of MgCl₂ = 0.363 mol
According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:
Moles of HCl = 2 * Moles of MgCl₂
Moles of HCl = 2 * 0.363 mol
Moles of HCl = 0.726 mol
To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.
Number of molecules of HCl = Moles of HCl * Avogadro's number
Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol
Number of molecules of HCl = 4.37 x 10^23 molecules
Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.
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PLEASE HELP ME THERES 100 POINTS ON THE LINE
Answers
Answer:
1.93 2.86
Explanation:
exactly the reason for the above text
What does it mean if an element has 8 valence electrons? O A. It has 8 protons. O B. It has a full octet. O O O O C. It reacts vigorously. O D. It is in Group 8.
Answers
Answer:
B
Explanation:
determine the amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay. The half-life of the isotope is 16.5 hours.
Answers
Based on the given half-life, the amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is 33 hours.
What is the half-life of a radioactive isotope?The time needed for a quantity to decrease to half of its initial value is known as the half-life. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last.
Any substance that contains unstable atoms that release ionizing radiation during their natural decay is considered radioactive material.
Given the half-life of the radioactive sample of an isotope of bromine to be 16.5 hours. The amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is calculated as follows:
After one half-life, half of the sample remains, and half decays
After two half-lives, 1/4 of the sample remains, and 3/4 decays
The time for two half-lives = 16.5 hours * 2
The time for two half-lives = 33 hours.
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the element chlorine is a member of which chemical family?
Answers
Answer:
is it from bleacH?
Explanation:
hazardous
Answer:
halogen family
Explanation:
Suppose a reaction mixture, when diluted with water, afforded 300 mL of an aqueous solution of 30 g of the reaction product malononitrile [CH2(CN)2], which is to be isolated by extraction with ether. The solubility of malononitrile in ether at room temperature is 20.0 g/100 mL, and in water is 13.3 g/100 mL. What weight of malononitrile would be recovered by extraction with (a) three 100-mL portions of ether and (b) one 300-mL portion of ether
Answers
The given question is not complete, the complete question is:
Suppose a reaction mixture, when diluted with water, afforded 300 mL of an aqueous solution of 30 g of the reaction product malononitrile [CH2(CN)2], which is to be isolated by extraction with ether. The solubility of malononitrile in ether at room temperature is 20.0 g/100 mL, and in water is 13.3 g/100mL. The ratio of these quantities is equal to the partition coefficient, k, which equals What weight of malononitrile would be recovered by extraction of (a) three 100-mL portions of ether and (b) one 300-mL portion of ether? SHOW WORK (Can be written in pen and attached to report). Suggestion: For each extraction, let x equal the weight extracted into the ether layer. In part (a), for the first of the three extractions, the concentration of malononitrile in the ether layer is x/100 and in the water layer is (30-x)/100.
Answer:
The correct answer is 10 grams and 18 grams.
Explanation:
Based on the given question, 20 gram per 100 ml is the solubility of malononitrile in ether, and 13.3 gram per 100 ml is the solubility of malononitrile in water.
Thus, the ration of the solubility is,
Solubility in water/solubility in ether = 20/13.3 = 1.50
a) Let w be the weight of malononitrile extracted into water in every extraction. Then the concentration of the ether layer will be w/100. The concentration in the water layer will be 30-w/300. Now the ratio will be,
Ratio = w/100 / (30-w)/300
1.50 = w/100 * 300 (30-w)
w = 10
Hence, the weight of malononitrile recovered by extraction is 10 grams.
b) The concentration in the ether layer will be w/300. The concentration in the water layer will be (30-w) / 300. Now the ratio will be,
Ratio = w/300 / (30-w) / 300
1.50 = w/300 * 300 (30-w)
w = 18
Hence, 18 grams is the weight of malononitrile recovered by extraction.
Stephan’s mother cuts a twig from a rose bush and plants it in the soil. After a few days, Stephan observes a new plant growing. Which characteristic does the growth of the new plant depict?
Answers
The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.
Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.
The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.
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Select the correct answer.
What are factors of production?
OA.
О в.
O c.
OD.
all the human efforts involved in the production process
all the resources used to produce any goods and services
all the physical tools and equipment used in the production process
all the naturally occurring resources found in land, air, and water
Reset
N
Answers
Answer: B. all the resources used to produce any goods and services
Explanation:
The factors of production are all the resources used to produce any goods and services. This means our answer is option B.
This includes, but is not limited to, land, labor, capital, and entrepreneurship.
Effects of Human Activity Wet Lab
- i just need a bit of help, like examples or something because i have no clue what to do or where to start ( EDGE 2023 8TH GRD)
(I WILL BRAINLIST ONCE I KNOW HOW)
Answers
Answer:
I don’t have any specific examples of wet labs that study the effects of human activity on wetlands. However, some common human activities that can affect wetlands include the construction of buildings and roads, agricultural land use, and overfishing. Wet labs can be used to study the impact of these activities on the physical, chemical, and biological processes in wetland ecosystems.
Fill in the Blank
All three types of rock form in which earth layer? _________.
A reversible change, where appearance is altered, but the composition stays the same is _________. An irreversible change that alters the chemical makeup of a substance is _________. Is the melting of ice into liquid water a physical or chemical change? _____ What is involved in any change in matter? ________
Answers
The lithosphere is where all three forms of rocks form. A physical change is a reversible change and chemical changes are irreversible. The melting of ice is a physical change and change of matter is chemical.
What are physical and chemical changes. ?The lithosphere is the layer of earth where all three types of rocks such as igneous, metamorphic, and sedimentary can be found. The physical changes are those that affect physical properties and are reversible like heating and cooling.
While the chemical changes are irreversible. The physical changes lead to the change in form of the substance while chemical change leads to the rearrange of matter.
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Chemical reactions are not an integral part of making synthetic materials
Chemical reactions are not an integral part of making synthetic materials
Answers
Answer: It does use synthetic material.
Explanation:
The series of chemical reactions that are used to change natural resources into synthetic products is called chemical synthesis. It is more natural than synthetic, because its shape has been changed, but the material is still wood.
Towards the end of the 1600’s the French physicist Guilluame Amontons noted that for any trapped gas whose volume and mass are held constant, the rise in temperature produces the same increase in pressure. The experimental values gave
Pressure = slope x Temperature (in ºC) + intercept
a linear relationship between pressure and temperature. Several years later, in 1779 Joseph Lambert defined absolute zero as the temperature at which the pressure of a gas becomes zero when a plot of gas pressure versus temperature is extrapolated to Pgas = 0. (See L. H. Adcock, J. Chem. Educ., 75, 1567-1568 (1998) for additional explanation.) How would the value of absolute zero defined in this manner theoretically compare to the value based on Charles’ law? How do these theoretical values compare to what your data for Charles' Law says is absolute zero?
Answers
The temperature at absolute zero, according to experimental data for Charles' Law, is -273.15 oC, which is in accordance with the Kelvin scale of temperature.
What is the comparison?Charles' Law states that when pressure and quantity are held constant, a gas's volume and temperature are exactly related. The temperature at absolute zero, often known as zero Kelvin, would be -273.15 oC if this connection were extrapolated to zero volume.
Lambert, on the other hand, established the relationship between pressure and temperature for a gas held at a fixed volume and mass as the basis for his definition of absolute zero. According to this notion, a gas's pressure would be 0 at absolute zero.
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Identify the correct chemical formula. Select one: O a. K₂C₂H₂O2 0 b. K2(OH)2 O c. KCIO3 O d. 504 MATU 20 A www. wowow
Answers
Answer:
B.K2(OH)2 i think that is the answer
All rivers have deltas; explain the process that forms these common landmasses.
Answers
How does a river form a delta?
Deltas are wetlands that form as rivers empty their water and sediment into another body of water. ... Deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. Although very uncommon, deltas can also empty into land.
what is the change in mass of A in
60 minutes?
Mass of A (g)
12.4
10.4
9.1
7.7
6.2
Time
O
15
30
45
60
Answers
Answer:
To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.
From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.
Therefore, the change in mass of A over 60 minutes is:
Final mass of A - Initial mass of A
= 6.2 g - 12.4 g
= -6.2 g
The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.
The change in mass of A over 60 minutes is -6.2 grams.
To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.
From the given information, we can see that the mass of A decreases over time.
Let's calculate the change in mass.
Initial Mass of A: 12.4 g
Final Mass of A: 6.2 g
Change in Mass of A = Final Mass of A - Initial Mass of A
= 6.2 g - 12.4 g
= -6.2 g
The change in mass of A over 60 minutes is -6.2 grams.
Note that the negative sign indicates a decrease in mass.
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All forms of energy can exist as either ________ or ________ energy.
Answers
Answer:
potentiol or kenetic
Explanation:
determine which reaction will occur.
1) 2Li(s) + Mg2+ = 2Li+ + Mg(s)
2) Fe(s) + Zn2+ = Fe2+ + Zn(s)
Answers
The first reaction 2Li(s) + Mg^2+(aq)---> 2Li^+(aq) + Mg(s) would occur because lithium is above magnesium in the electrochemical series.
Which reaction would occur?We know that the possibility that one metal can be able to displace the other is only brought about by the position of the metals in the electrochemical series.
We know that the metals that are higher in the series are able to displace the metals that are lower in the series from an aqueous solution of the salts of the lower metal. In this case the lithium metal is above the magnesium metal so it can be able to displace it from solution.
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Given the analyte of Adipic acid with F=0.1 M and volume=0.01 L and 146.142 g/mol. Given Titrant NaOH=0.05 M. Given a titration curve where Pka1 is at 0.01 L titrant added with a ph of 4.43 and Pka2 is at 0.03 L titrant added with a PH of 5.41. Given the first equivalence point is at 0.02 L titrant added and the second equivalence point is at 0.04 L added. Find the PH values when titrant added=0, at equivalence point 1(0.02 L added), at 0.037 L titrant added, and at equivalence point 2(0.04 L added)
Answers
Using the Henderson-Hasselbalch equation, the pH value when no titrant is added is 4.44.
What is the pH of the Adipic solution?To solve this problem, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([A-]/[HA])where;
pH is the pH value,pKa is the acid dissociation constant,[A-] is the concentration of the conjugate base, and[HA] is the concentration of the acid.We can use this equation to calculate the pH values at different points during the titration.
When no titrant is added:
At this point, we have only the adipic acid in the solution, so we can use the equation:
pH = pKa + log([A-]/[HA])
pH = pKa + log(0/0.1)
pH = pKa = 4.44
pH = 4.44
The other pH values are obtained similarly using the Henderson-Hasselbalch equation.
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PLEASE HELP!!!!!!
A student starts with 0.303 g of pure 4-aminobenzoic acid, (molar mass 137.14 g/mol) and ends up with 0.318 g of benzocaine (molar mass 165.19 g/mol).
Given that ethanol is in excess, what are the theoretical and percent yields for this reaction? Assume all starting material is converted to product when calculating the theoretical yield
Answers
Answer:
\(m_{B}^{theoretical}=0.365gB\)
\(Y=87.1\%\)
Explanation:
Hello there!
In this case, since the reaction (A->B) have an initial amount of pure 4-aminobenzoic acid, the first step to compute the theoretical yield is to solve the following stoichiometric setup:
\(m_{B}^{theoretical}=0.303gA*\frac{1molA}{137.14gA}*\frac{1molB}{1molA}*\frac{165.19 gB}{1molB}\\\\ m_{B}^{theoretical}=0.365gB\)
Whereas A stands for 4-aminobenzoic acid and B for the benzocaine. Moreover, we compute the percent yield by dividing the actual yield (0.318 g) by the theoretical one (0.365 g):
\(Y=\frac{0.318g}{0.365g} *100\%\\\\Y=87.1\%\)
Best regards!
The percentage yield obtained when 0.303 g of 4-aminobenzoic acid react with excess ethanol is 87.1%
We'll begin by calculating the theoretical yield of benzocaine. This can be obtained as follow:From the balanced equation given in the question above,
137.14 g of 4-aminobenzoic acid reacted to produce 165.19 g of benzocaine.
Therefore,
0.303 g of 4-aminobenzoic acid will react to produce =\(\frac{0.303 * 165.19}{137.14}\) = 0.365 g of benzocaine.
Thus, the theoretical yield of benzocaine is 0.365 g
Finally, we shall determine the percentage yield. This can be obtained as follow:Actual yield of benzocaine = 0.318 g
Theoretical yield of benzocaine = 0.365 g
Percentage yield =?\(Percentage yield = \frac{Actual}{Theoretical} * 100\\\\= \frac{0.318}{0.365} * 100\\\\\)
= 87.1%Therefore, the percentage yield for the reaction is 87.1%
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For electricity to flow, what do you need?
A
only a battery
B
only a battery and a light bulb
only a battery, light bulb and wire
D
a battery, light bulb and wire in a closed circuit
Answers
Answer:
D
Explanation:
you need battery, light bulb and wire in a close circuit
Answer:
D - a battery, light bulb and wire in a closed circuit.
Explanation:
A battery due to the charge in it.
A light bulb so the energy has somewhere to go to.
A wire in a closed circuit, so that the energy has a place for transport without interruptions.
The container seems to have about 650 mL of copper(II) sulfate
solution in volume. Convert this volume to liters (L) of
solution.
Answers
The volume of copper (II) sulfate in a container is equivalent to 0.650L.
How to convert units of volume?Volume is the three-dimensional measure of space that comprises a length, a width and a height. It is measured in units of cubic centimeters (cm³) in metric, cubic inches or cubic feet in English measurement.
According to this question, a container seems to have about 650 mL of copper(II) sulfate solution in volume. The volume can be converted to litres as follows:
1 millilitre = 0.001 litre
650 millilitres = 0.650 litres
Therefore, 0.650L is the volume of copper II sulfate in litres.
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write name of a plant having aquatic habitat
Answers
Answer:
Cattail
Explanation:
Cattail is the plant which have aquatic habitat.
What is aquatic habitat?An area with water that directly supports a particular species, population, as well as the community is referred to as an aquatic habitat.
What is Cattail?Cattails were also perennial upright plants that grow from rhizomes which creep. The long, tapering petals seem to be slightly spongy and even have smooth borders.
Cattail is a plant which has aquatic habitat.
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1. A solution contains an unknown amount of dissolved magnesium. Addition of0.0877 mol of Na2CO3 causes complete precipitation of all of the magnesium.What mass of magnesium was dissolved in the solution?
Answers
Answer:
4.25 g of magnesium.
Explanation:
What is given?
moles of Na2CO3 = 0.0877 moles.
molar mass of Mg (magnesium) = 24.3 g/mol.
Step-by-step solution:
First, let's state the chemical equation between Mg (magnesium) and Na2CO3:
\(\text{2 Mg+Na}_2CO_3\rightarrow Mg_2CO_3+2Na.\)You can see that 1 mol of Na2CO3 reacts with 2 moles of Mg, so let's see how many moles of Mg are being produced by 0.0877 moles of Na2CO3:
\(0.0877\text{ moles Na}_2CO_3\cdot\frac{2\text{ moles Mg}}{1\text{ mol Na}_2CO_3}=0.175\text{ moles Mg.}\)And the final step is to convert from 0.175 moles of Mg to grams using its molar mass. The conversion will look like this:
\(0.175\text{ moles Mg}\cdot\frac{24.3\text{ g Mg}}{1\text{ mol Mg}}=4.25\text{ g Mg.}\)The answer is that there is 4.25 g of magnesium dissolved in the solution of 0.0877 moles of Na2CO.
Arteries do not contain muscle of any type.
True or False?
Answers
False.
Arteries are said to be more muscular.
That means Arteries ARE* MUSCLES