Answers
Answer: .063
Explanation:
1.53g Mg * (1 mol Mg/ 24.3 g Mg) * (1 mol H2/1 mol Mg) = .063 mol H2
The mole of hydrogen gas that will be produced from the reaction would be 0.0630 moles.
From the equation of the reaction:
\(Mg(s) + 2 HCl(aq) ---> MgCl_2(aq) + H_2(g)\)
The mole ratio of Mg to H2 gas is 1:1. Thus, for every one mole of Mg consumed by the reaction, 1 mole of H2 is produced, all other things being equal.
Recall that: mole = mass/molar mass
1.53 g of magnesium = 1.53/24.3
= 0.0630 mole (to 3 significant figures)
Since the mole ratio of Mg to H2 is 1:1, it means that the number of moles of hydrogen gas produced would also be 0.0630 moles.
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Related Questions
The fluorocarbon compound C2Cl3F3 has a normal boiling point of 47.6 °C. The specific heat of this compound in the liquid state is 0.91 J/g-K and in the gas state is 0.67 J/g-K. The heat of vaporization is 27.5 kJ/mol. What is the amount of heat required to convert 5.6 g of the compound from a liquid at 30.0 °C to a gas at 60.5 °C?
Answers
The amount of heat required to convert 5.6 g of the compound from a liquid at 30.0 °C to a gas at 60.5 °C is approximately 1.183 kJ.
To calculate the amount of heat required to convert 5.6 g of the compound from a liquid at 30.0 °C to a gas at 60.5 °C, we need to consider the heat required for temperature change and the heat of vaporization.
First, let's calculate the heat required for the temperature change from 30.0 °C to the boiling point of 47.6 °C in the liquid state:
q1 = mass * specific heat * temperature change
= 5.6 g * 0.91 J/g-K * (47.6 °C - 30.0 °C)
= 81.23 J
Next, let's calculate the heat required for the phase change from liquid to gas:
q2 = heat of vaporization * number of moles
= 27.5 kJ/mol * (5.6 g / molar mass)
= 27.5 kJ/mol * (5.6 g / 146.39 g/mol)
= 1.051 kJ
Finally, let's calculate the heat required for the temperature change from the boiling point to 60.5 °C in the gas state:
q3 = mass * specific heat * temperature change
= 5.6 g * 0.67 J/g-K * (60.5 °C - 47.6 °C)
= 51.02 J
The total amount of heat required is the sum of q1, q2, and q3:
q_total = q1 + q2 + q3
= 81.23 J + 1.051 kJ + 51.02 J
= 1.132 kJ + 51.02 J
= 1.183 kJ
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WILL AWARD BRAINLIEST! I NEED HELP PLEASE! Match the states of matter for each of the five lines below.
Answers
Answer:
see explanations
Explanation:
The graphic is the heating curve for water. Note that it is divided into 5 distinct heat flow segments. The segments with changing slopes are single phase segments with changes in temperature values. From left to right segment A is solid ice being warmed to it's melting point. Segment B is the melting segment in which 2 phases are in contact (solid + liquid). Note that addition of heat does not change the temperature. Segment C is warming of the liquid (single phase) up to its boiling point. At the boiling point the liquid begins to pass into the gas phase and again 2 phases are in contact; i.e., liquid & gas. Note again when two phases are in contact no temperature change occurs. Finally, segment E is the heating of the pure, single phase gas.
In summary ...
Segment A => heating single phase (solid) ice up to melting pt.
Segment B => melting of ice => 2 phases in contact (s & l) ΔT = ∅.
Segment C => heating single phase (liquid) water up to boiling pt.
Segment D => boiling of liquid => 2 phases in contact (l & g). ΔT = ∅.
Segment E => heating single phase (steam) up to desired temperature.
For what it's worth, the equation for the segments that show increasing temperature values is q = mcΔT (m= mass, c = specific heat & ΔT temp change.
The segments with zero slopes (horizontal lines) are defined by equations q = m·ΔHₓ where m = mass & ΔHₓ = heat of fusion (a constant = 335 j/g). The same is true for the line at 100°C where q = m·ΔH(v) where m = mass & ΔH(v) is the heat of vaporization (a constant = 2259 j/g.
Calculations involve calculating the amount heat transfer for each segment individually and then adding the heat values to obtain the total heat transfer.
If you need more instruction on this topic, kick back a note and I'll try to help clarify. Good Luck, Doc :-)
Answer:
Picture attached has answers
Explanation:
Describe and explain the relationship between the wavelength and frequency of RADIO WAVES & MICROWAVES. (i need 5 to 8 sentences)
Answers
The wavelength of the radio waves is longer than that of the microwaves while microwaves have a larger frequency than radio waves.
What is the frequency?We know that the frequency of a wave refers to the number of cycles that is covered by a wave in a second. We also know that the wavelength has to do with the horizontal distance that is covered by a wave.
Both the radio waves and the microwaves are known to the part of the electromagnetic spectrum. These are the waves that are known to have the same velocity and are able to pass through a vaccum.
Though all the electromagnetic waves do have the same speed, they do not have the same frequency, wavelength and energy. It is known that the wavelength is inversly related to the frequency of the wave. As such, the greater the wavelength, the smaller the frequency.
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plants have a life cycle of just one year.
Answers
Answer:
some plants (bloom) are annuals.
Explanation:
annuals are one year
perennials are annually
The following two organic compounds are structural isomers to each other. Carefully identify and justify the structural isomers type (skeletal, functional, or positional) with their common molecular formula
Answers
Structural isomers are molecules with the same molecular formula but with different structural formulae. This means that they have the same number and types of atoms, but they are arranged differently. The following two organic compounds are structural isomers of each other.
Carefully identify and justify the structural isomers type (skeletal, functional, or positional) with their common molecular formula.Common molecular formula: C6H14Structural isomers:(i) Hexane: Hexane is a straight-chain alkane with six carbon atoms and no double bonds or rings. The carbon atoms are linked together in a linear or straight-chain configuration in the skeletal isomer. The skeletal isomer differs in terms of the arrangement of atoms in its molecule. This indicates that it is a skeletal isomer.(ii) 2-methylpentane: It is a branched-chain alkane with six carbon atoms and no double bonds or rings. It differs from the first molecule in terms of the location of a methyl group on the second carbon of the five-carbon chain, rather than a straight six-carbon chain. This difference is due to a change in the positioning of the carbon atoms in the molecule. As a result, it is a positional isomer, as it differs by the position of the functional group or substituent. Therefore, the skeletal and positional isomerism types are present between these two compounds.For such more question on molecular
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Is the ethane molecule more or less polar than water? Why or why not?
Answers
Answer: Less
Explanation:
Ethane is a non-polar molecule while water is a polar molecule
An element has 2 stable isotopes. One has 13 amu and 1.07% abundant . The second has 12 amu and 98.93% abundant. What is the average atomic mass of the element
Answers
The average atomic mass of the element is 12.0107 amu.
To calculate the average atomic mass of the element in question, we can use the following formula:
average atomic mass = (mass of isotope 1 x abundance of isotope 1) + (mass of isotope 2 x abundance of isotope 2)
where "mass of isotope 1" is the mass of the first stable isotope (13 amu in this case), "abundance of isotope 1" is the percentage of that isotope in the element (1.07% in this case), "mass of isotope 2" is the mass of the second stable isotope (12 amu in this case), and "abundance of isotope 2" is the percentage of that isotope in the element (98.93% in this case).
Substituting the given values in the formula, we get:
average atomic mass = (13 amu x 1.07%) + (12 amu x 98.93%)
average atomic mass = (0.1391 amu) + (11.8716 amu)
average atomic mass = 12.0107 amu
Therefore, the average atomic mass of the element is 12.0107 amu.
This means that on average, one atom of this element weighs 12.0107 atomic mass units (amu), which is slightly heavier than the most abundant isotope (12 amu) due to the presence of the less abundant isotope (13 amu). This concept is important in chemistry because the mass of atoms plays a crucial role in determining their chemical and physical properties. The knowledge of the average atomic mass of an element is important in a wide range of applications, including analytical chemistry, geochemistry, and nuclear physics.
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Fill in the following chart: 100 points!
**If there is a + sign that means there are less electrons. If there is a sign, there are more electrons.
Answers
Answer:
Calcium atom:
20 protons, 20 electrons
Calcium 2+ ion:
It is a calcium atom but with 2 fewer electrons, so
20 protons, 18 electrons
Oxygen atom:
8 protons and 8 electrons
Oxygen 2- ion:
It is an oxygen atom but with 2 more electrons, so
8 protons, 10 electrons
Calcium oxide:
Add protons and electrons of of Ca with O to get:
20 + 8 protons = 28 protons, 20 + 8 electrons: 28 electrons.
Alternatively, add protons and electrons of Ca{2+} and O{2-} to get the same result.
The correct number of protons and electrons of the given ions are as follows:
Ca atom = 20 protons, 20 electronsCa2+ ion = 20 protons, 18 electronsO atom = 8 protons, 8 electronsO2- ion = 8 protons, 10 electronsHow to calculate protons and electrons?The number of protons and electrons in an atom or ion determines the overall charge of the ion or atom.
In a neutral atom, the number of protons and electrons are equal, hence, the overall charge of the atom is 0. However, in a charged atom (ion), the difference between the proton and electron number is the base.
It is important to note that the number of protons is the atomic number of an atom, hence, does not change. However, the number of electrons changes depending on whether electrons are gained or lost.
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¿En que se basa la clasificación de los carbohidratos?
Answers
Answer:
Los carbohidratos se pueden dividir en tres grupos: monosacáridos, ejemplo, glucosa, fructosa, galactosa; disacáridos, ejemplo, sacarosa (azúcar de mesa), lactosa, maltosa; polisacáridos, ejemplo, almidón, glicógeno (almidón animal), celulosa.
espero que te ayude
convert 8.4 • 10^16 molecules of CO2 to moles
Answers
Answer:
0.00000000000000084
Explanation:
What chemicals have a saturation concentration less than 5 but greater than 2
Answers
Saturation concentration refers to the highest concentration of a substance that can exist in a solution in equilibrium with its solid or gaseous form. A saturation concentration less than 5 but greater than 2 is a relatively broad range, and many different chemicals could fall within this range depending on the conditions of the solution.
Examples of chemicals with saturation concentration less than 5 but greater than 2 include:
Calcium carbonate, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure
Iron(III) hydroxide, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure
Potassium chloride, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure
Ammonium chloride, which has a saturation concentration of around 2.5 g/L at room temperature and normal pressure
Sodium sulfate, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure
It's important to note that these are just examples, the saturation concentration of a chemical can vary depending on temperature, pressure, and other factors.
Convert 6.75 cm to mm
Answers
Answer: 67.5
Explanation:
Brainliest pls
A buffer solution contains 0.496 M KHCO3 and 0.340 M K2CO3. If 0.0585 moles of potassium hydroxide are added to 250. mL of this buffer, what is the pH of the resulting solution
Answers
Answer:
pH = 10.9
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to say that the undergoing reaction between this buffer and OH⁻ promotes the formation of more CO₃²⁻ because it acts as the base, we can do the following:
\(n_{CO_3^{2-}}=0.34mol/L*0.250L+0.0585mol=0.1435mol\\\\n_{HCO_3^{-}}=0.34mol/L*0.250L-0.0585mol=0.0265mol\)
The resulting concentrations are:
\([CO_3^{2-}]=\frac{0.1435mol}{0.25L}=0.574M \\\)
\([HCO_3^{-}]=\frac{0.0265mol}{0.25L}=0.106M\)
Thus, since the pKa of this buffer system is 10.2, the change in the pH would be:
\(pH=10.2+log(\frac{0.574M}{0.106M} )\\\\pH=10.9\)
Which makes sense since basic OH⁻ ions were added.
Regards!
A 54.2 g sample of polystyrene, which has a specific heat capacity of 1.880 J-gc, is put into a calorimeter (see sketch at
right) that contains 100.0 g of water. The temperature of the water starts off at 21.0 °C. When the temperature of the water stops
changing it's 34.3 °C. The pressure remains constant at 1 atm.
Calculate the initial temperature of the polystyrene sample. Be sure your answer is rounded to the correct number of significant
digits.
thermometer.
insulated
container
water
sample.
a calorimeter
Answers
Tthe initial temperature of the polystyrene sample is 39.4°C.
Given: Mass of polystyrene sample = 54.2 gSpecific heat of polystyrene = 1.880 J-g°CWater mass = 100.0 g Initial water temperature = 21.0°CWater final temperature = 34.3°CPressure remains constant at 1 atmFormula used:Heat gained by water = heat lost by polystyreneHence,Heat lost by polystyrene = Heat gained by water=> mcΔT = mcΔTwhere,m = mass of polystyrene or waterc = specific heat capacityΔT = change in temperatureThe temperature change is ΔT = 34.3°C - 21.0°C = 13.3°CNow we can use this temperature change to calculate the initial temperature of the polystyrene.Taking the water's specific heat capacity, c = 4.184 J/g°CHeat gained by water = (100.0 g)(4.184 J/g°C)(13.3°C) = 5574 JHeat lost by polystyrene = 5574 JTaking the polystyrene's specific heat capacity, c = 1.880 J/g° ) = 13.3°C Now let's calculate the mass of polystyrene using the specific heat capacity formula.5574 J = (54.2 g)(1.880 J/g°C)(13.3°C - Ti)Ti = 39.4°C
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40 POINTS!
Answer correctly for full 40!
Answers
Answer:
A. cell wall
Explanation:
A cell wall is rigid and is the outermost layer. It also shapes the cell.
A cell membrane is the inner portion of the cell wall and very flexible, not rigid.
The nucleus is not a membrane, it is the center of cell containing genetic information.
The mitochondria is within the cell and it known as the "powerhouse" of the cell.
- Hope that helps! Please let me know if you need further explanation.
Answer:
Jesus loves you
During seafloor spreading, what kind of new earth forms?
Answers
Answer:
This bubbled-up magma is cooled by frigid seawater to form igneous rock. This rock (basalt) becomes a new part of Earth's crust. Seafloor spreading occurs along mid-ocean ridges—large mountain ranges rising from the ocean floor.
Explanation:
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Which statements describe the nature of science? (Select 5)
1. Scientists engage in peer reviews to avoid bias.
2. Science is a blend of logic and innovation.
3. Scientific ideas are not durable and cannot adjust to change as new data is collected.
4. Science is not observational .
5. Science is a complex social endeavor.
6. Natural world is understandable.
7. Scientists try to remain objective.
Answers
Answer:
2
Explanation:
Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.
Peer reviews are used by scientists to ensure objectivity and reduce prejudice in their study. To create original ideas and hypotheses, scientists need both logical reasoning and creative thinking.
As scientists frequently interact, exchange ideas, and build on one another's work, it is a complex social endeavour. Understanding and making sense of the natural world is the central tenet of science.
Finally, scientists separate their personal beliefs from empirical evidence in order to stay as objective as possible in their research.
Thus, Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.
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If the student’s estimate of the balloon’s volume was incorrect and the actual volume was 620 ml, would the amount of glucose that actually reacted be more than or less than the amount calculated in part (c)? Explain your response.
( C answer ) only 1.9 g of glucose reacted and only .0211 mol of co2 was formed.
Answers
The number of moles of CO2 produced is 0.021 moles
If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.
What is respiration equation?The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).
The equation of the reaction is;
C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP
We know that;
Number of moles of glucose = 10 g/180 g/mol
= 0.056 moles
PV = nRT
n = PV/RT
n = 1 * 0.55/318 * 0.082
n = 0.021
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How did Mendeleeb come up woth the periodic table?
Answers
Answer:
Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.
Answer:
On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table. So convinced was he of the soundness of his periodic law that he left gaps for these elements in his table.
How much work in joules is done on the system when a 1.15 atm external pressure causes a piston to decrease in volume in volume from 6.55 Liters to 3.16 Liters ?
Answers
We have according to the statement a gas to which external pressure is exerted to reduce its volume. We will first assume that the process occurs at a constant temperature and pressure. The work done by that external force is determined by the following form of work (W):
\(W=-P\times\Delta V\)\(W=-P\times(V_2-V_1)\)Where,
P is the external pressure, 1.15atm
V2 is the final volume, 3.16L
V1 is the initial volume, 6.55L
We replace the known values:
\(\begin{gathered} W=-1.15atm\times(3.16L-6.55L) \\ W=3.8985atm/L \end{gathered}\)We will convert these units to joules. 1atm/L=101.325J.
\(W=3.8985atm/L\times\frac{101.325J}{1atm/L}=395J\)Answer: The work in joules done is 395 J
Features passed from parent to offspring, such as eye color, is an example of what?
Answers
The reaction where sodium (Na) reacts with water to produce hydrogen gas is a type of reaction.
Answers
Answer:
In what way and in what form does sodium react with water? A colourless solution is formed, consisting of strongly alkalic sodium hydroxide (caustic soda) and hydrogen gas. This is an exothermic reaction.
11. Write down the molecular formula of following compounds by
criss-cross
method
a. Ammonia
b. Methane
c. Common salt
d.Limestone
e.Hydrochleric acid
f.Caustic soda
Answers
Answer:
a. NH3
b.
c. NaCl
d.
e. HCl
f.
Weathering in action exploration
Answers
Answer:
what were you asking??
Explanation:
Answer:
???
Explanation:
Hi can someone help me with this homework
Answers
We must melt about 3.8 kg of brass A, 4.1 kg of brass B, and 6.5 kg of brass C to obtain about 14.5 kg of the desired alloy
How do we calculate?we can set up a system of equations based on the conservation of mass and the desired composition:
0.533x + 0.247y + 0.220z = 14.5 (desired composition of copper, zinc, and nickel)
The given information includes:
Brass A: 41% copper, 23% zinc, 36% nickel
Brass B: 54% copper, 23% zinc, 23% nickel
Brass C: 56% copper, 26% zinc, 18% nickel
Using this information, we can write the following equations:
0.41x + 0.54y + 0.56z = 0.533(x + y + z) (copper)
0.23x + 0.23y + 0.26z = 0.247(x + y + z) (zinc)
0.36x + 0.23y + 0.18z = 0.220(x + y + z) (nickel)
Simplifying each equation, we get:
0.067x - 0.027y - 0.023z = 0 (copper)
-0.017x + 0.017y + 0.003z = 0 (zinc)
-0.020x - 0.027y + 0.038z = 0 (nickel)
We can solve the equations using substitution method or elimination method and our values will be:
x = 3.8462
y = 4.1077
z = 6.5461
In conclusion, we need to melt about 3.8 kg of brass A, 4.1 kg of brass B, and 6.5 kg of brass C to obtain about 14.5 kg of the desired alloy.
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How is the mass in grams of the element converted to amount in atoms
Answers
VITAMIN C IN FRUIT JUICE
Why might it be difficult to use this method to determine the amount of Vitamin C in other fruit juices such as cranberry, blackcurrant, or pomegranate juice?
Answers
The method for determining the sum of Vitamin C in fruit juice ordinarily includes adding an indicator (such as DCPIP) to the juice test and titrating the test with a standard arrangement of ascorbic corrosive until the marker changes colour.
In any case, there are a few variables that seem to make this strategy troublesome to utilize for other natural product juices such as cranberry, blackcurrant, or pomegranate juice:
Interference with the indicator: A few natural product juices may contain compounds that are meddled with the marker and anticipate it from changing colour indeed when all the Vitamin C has been titrated. This may lead to wrong comes about.Presence of other reducing agents: Natural product juices may contain other diminishing operators other than Vitamin C, such as fructose or glucose, which can moreover respond with the marker and create wrong positive comes about.Differences in Vitamin C substance: Diverse natural products contain distinctive sums of Vitamin C, and the sum of Vitamin C in a specific juice can change depending on variables such as the readiness of the fruit and the handling strategy utilized. This will make it troublesome to compare the Vitamin C substance of diverse natural product juices utilizing the same strategy.Differences in pH: The pH of natural product juices can moreover change, and this could influence the solidness of Vitamin C and the precision of the titration strategy.In this manner, whereas the strategy for deciding the sum of Vitamin C in natural product juice can be a valuable apparatus, it may not be appropriate for all sorts of natural product juices and may have to be be adjusted or adjusted to account for these variables.
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Spread your smarts while you wait.
Answers
Answer:
lol ok 1+1=2 2 x 2=4
have a good day :)
Explanation:
Answer: oke
Explanation: have a goood day!
Complete the following table, which lists information about the measured acid dissociation constants of three unknown weak acids.
Answers
Three unidentified weak acids' observed acid dissociation constants are shown in the table as 3, 2, and 1, respectively.
How is the weak acid dissociation constant calculated?Acids that do not fully dissociate in solution are referred to as weak acids. In other terms, an acid that is weak is one that is not powerful. The degree to which weak acids dissociate determines their strength. The acid gets stronger the more it dissociates. Because it almost entirely dissociates, HCl is a powerful acid.
KCl is a naturally occurring salt that possesses a strong basic cation and a strong acidic anion; none of these cations or anion alter the pH of paper. Its normal pH value is 7.0, which is neutral.
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Which statements describe an element? Check all that apply.
An element is a pure substance.
An element is made of only one type of atom.
An element is made of two or more different types of atoms.
An element can be broken down into a simpler form.
An element cannot be broken down into a simpler form.
Answers
Answer:
An element is a pure substance.
An element is made of only one type of atom.
An element cannot be broken down into a simpler form.
Explanation: