Answer:
"3.90M" if approximate
Explanation:
if u didn't understood why i converted volume from millilitres to litre then refer defination of Molarity.
hope it help:)
Hello please someone help me with this
An equation is formed of two equal expressions. The value of x in the given equation can be -5.237 or 3.437.
What is an equation?An equation is formed when two equal expressions are equated together with the help of an equal sign '='.
In the given equation, the value of x can be found as shown below,
x²/(0.001 - x) = 1.8 × 10⁻⁴
x²/(0.001 - x) = 1.8/10000
x² · 10000 = (0.001 - x) · 1.8
\(x=\dfrac{-0.00018+\sqrt{0.0000007524}}{2},\:x=\dfrac{-0.00018-\sqrt{0.0000007524}}{2}\)
x = -5.237, 3.437
Hence, the value of x in the given equation can be -5.237 or 3.437.
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Consider the balanced reaction:
C3H8 + 5 O2 → 3 CO2 + 4 H2O
How many mol of C3H8 must be consumed via this reaction to produce a partial pressure of 3.68 atm of CO2 in a 4.00 L container at 355 K?
The number of moles of C₃H₈ that must be consumed via the given reaction is 0.168 mole
How do I determine the number of mole of C3H8 consumed?We'll begin by obtaining the mole of CO₂ produced. Details below:
Pressure (P) = 3.68 atmVolume (V) = 4 LTemperature (T) = 355 K Gas constant (R) = 0.0821 atm.L/Kmol mole of CO₂ (n) =?PV = nRT
3.68 × 4 = n × 0.0821 × 355
Divide both sides by (0.0821 × 355)
n = (3.68 × 4) / (0.0821 × 355)
n = 0.505 mole
Finally, we shall determine the mole of C₃H₈ consumed by the reaction. This is illustrated below:
C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O
From the balanced equation above,
3 moles of CO₂ were obtained from 1 mole of C₃H₈
Therefore,
0.505 mole of CO₂ will be obtained from = (0.505 × 1) / 3 = 0.168 mole of C₃H₈
Thus, number of mole of C₃H₈ consumed is 0.168 mole
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write anode and cathode in Zn-Ag galvanic cell
Explanation:
Zinc is the anode (solid zinc is oxidised). Silver is the cathode (silver ions are reduced).
By convention in standard cell notation, the anode is written on the left and the cathode is written on the right. So, in this cell: Zinc is the anode (solid zinc is oxidised). Silver is the cathode (silver ions are reduced).
Rank each structural feature according to increasing energy difference between the ground state and excited state electrons. (lowest on top)
The structural feature according to increasing energy difference between the ground state and excited state electrons is given as (i) conjugated polyene (ii) conjugated diene (iii) isolated diene.
Generally, chemical energy is defined as the energy which is stored in the bonds of chemical compounds (molecules and atoms). Chemical energy is released in the chemical reaction and mostly produces heat as a by-product which is known as an exothermic reaction.
The ground state of an electron is defined as the energy level that it usually occupies, is the state of lowest energy for that electron. There is also a maximum energy present that each electron can have and still be part of its atom.
Generally, the excited state describes an atom, ion or molecule with an electron in a higher than normal energy level than its ground state.
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Which reason best explains why metals are malleable
Because they have delocalized electrons
Because they have localized electrons
Because they have ionic bonds
Because they have rigid bonds
Answer:
A.) because they have delocalized electrons
Explanation:
This is right on edg. 2020
Answer:
Bruzaaubrey is 100% correct
Explanation:
the proper answer is: "Because they have delocalized electrons(A)"Make sure to mark bruzaaubrey brainliest :)
Calculate the volume of a balloon that can hold 113.4 g of nitrogen dioxide, NO2 gas at STP-
Answer:
55.18 L
Explanation:
First we convert 113.4 g of NO₂ into moles, using its molar mass:
113.4 g ÷ 46 g/mol = 2.465 molThen we use the PV=nRT formula, where:
P = 1atm & T = 273K (This means STP)n = 2.465 molR = 0.082 atm·L·mol⁻¹·K⁻¹V = ?Input the data:
1 atm * V = 2.465 mol * 0.082atm·L·mol⁻¹·K⁻¹ * 273 KAnd solve for V:
V = 55.18 Lmass of 1×10^25 molecules of water
Answer:
1.E25 it is the answer the answer to mass of 1×10^25 molecules of water
Explanation:
this is just EXPLINATION find your answer using this
first divide the number of molecules by Avogadro's number 6.022*10^25
you will
l get no. of Moles of water
multiply the no. of Moles with mass of 1 Mole of water 18g per mole
if get answer you comment
you should try on your own you will understand better
How many atoms are in 12 g of Carbon-12 (12C)?
There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).
The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.
Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.
Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.
In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.
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The half-life for a first-order reaction is 32 s. What was the original concentration if, after 2.0 minutes, the reactant concentration is 0.062 M?
Answer:
0.834 M.
Explanation:
Hello!
In this case, since this is a first-order reaction, we can infer that the half-life and the rate constant are related via:
\(t_{1/2}=\frac{ln(2)}{k}\)
Thus, we are able to compute the rate constant:
\(k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{32s}\\\\k=0.0217s^{-1}\)
Next, since we have the resulting concentration of the reactant and we need the initial one, we proceed as shown below with the rate law:
\(A=A_0exp(-kt)\\\\A_0=\frac{A}{exp(-kt)} \\\\A_0=\frac{0.062M}{exp(-0.0217s^{-1}*2.0min*\frac{60s}{1min} )}\\\\A_0=0.834M\)
Best regards!
Calculate the molality of the following solution: 3.20 moles of ethylene glycol (C2H6O2) in 3746 g of water
To calculate the molality (m) of a solution,
We will need to divide the number of moles of solute (n) by the mass of the solvent (in kg).
First, we will need to convert the mass of water from grams to kilograms:
mass of water = 3746 g = 3.746 kg
Next, calculate the number of moles of ethylene glycol:
moles of ethylene glycol = 3.20 moles
After finding the number of ethylene glycol, we will use the formula to calculate the molality:
m = moles of solute / mass of solvent (in kg)
m = 3.20 moles / 3.746 kg
Simplifying this calculation, we get:
m = 0.853 mol/kg
Therefore, the molality of the solution is 0.853 mol/kg.
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The exhaust from car engines spreads throughout our atmosphere and adds to pollution. What is this an example of?
A.
An increase in enthalpy
B.
An increase in thrust
C.
An increase in thermodynamics
D.
An increase in entropy
(D is the correct answer!)
Answer: When exhaust from car engines spreads throughout our atmosphere and adds to pollution then it is an example of increase in entropy.
Explanation:
A degree of randomness in the molecules of a substance is called entropy.
When exhaust from car engines spreads throughout our atmosphere then it means the molecules are moving at a faster speed due to which they spread into the atmosphere rapidly.
This means that the entropy of exhaust is increasing.
Thus, we can conclude that when exhaust from car engines spreads throughout our atmosphere and adds to pollution then it is an example of increase in entropy.
An increase in entropy
A mixture of 0.327 M Cl 2 , 0.579 M F 2 , and 0.839 M ClF is enclosed in a vessel and heated to 2500 K . Cl 2 ( g ) + F 2 ( g ) − ⇀ ↽ − 2 ClF ( g ) K c = 20.0 at 2500 K Calculate the equilibrium concentration of each gas at 2500 K .
Cl2 (g) + F2 (g) ⇌ 2ClF (g)
Kc = [ClF]^2 / [Cl2][F2]
Let x be the change in concentration of ClF, Cl2, and F2 at equilibrium. Then the equilibrium concentrations can be expressed as:
[ClF] = 0.839 M + x
[Cl2] = 0.327 M - x
[F2] = 0.579 M - x
Substituting these expressions into the equilibrium constant expression and solving for x gives:
20.0 = ([0.839 + x]^2) / ([0.327 - x][0.579 - x])
Expanding the numerator and denominator and simplifying, we get:
20.0 = (0.704x^2 + 3.321x + 0.702) / (-0.189x^2 + 0.463x - 0.190)
Multiplying both sides by the denominator and rearranging, we get a quadratic equation:
0.189x^2 - 3.880x + 3.032 = 0
Using the quadratic formula, we find that:
x = 7.68 × 10^-2 M
Substituting this value back into the expressions for the equilibrium concentrations gives:
[ClF] = 0.839 M + 7.68 × 10^-2 M = 0.917 M
[Cl2] = 0.327 M - 7.68 × 10^-2 M = 0.250 M
[F2] = 0.579 M - 7.68 × 10^-2 M = 0.501 M
Therefore, the equilibrium concentrations of ClF, Cl2, and F2 at 2500 K are 0.917 M, 0.250 M, and 0.501 M, respectively.
Which seasons in Atlanta GA have worst AQI
In Atlanta, GA, certain seasons are associated with poorer air quality due to various factors such as weather conditions, human activities, and geographical location.
Typically, the seasons with the worst AQI in Atlanta, GA, are summer and early fall. This is primarily due to the combination of high temperatures, stagnant air masses, and increased pollution from various sources.
During the summer months, Atlanta experiences hot and humid weather, which can contribute to the formation of ground-level ozone. Ozone is a harmful pollutant that is created when pollutants from vehicles, power plants, and industrial activities react with sunlight and heat. High levels of ozone can cause respiratory issues and other health problems.
In addition to ozone, Atlanta also experiences increased levels of particulate matter (PM) during the summer and early fall. PM refers to tiny particles suspended in the air, which can come from sources such as vehicle exhaust, industrial emissions, and wildfires.
These particles can be inhaled into the lungs and can have detrimental effects on respiratory health.
It's important to note that air quality can vary from year to year and is influenced by various factors. Local regulations, weather patterns, and changes in pollutant emissions can all impact the AQI during different seasons.
Monitoring air quality reports and taking necessary precautions such as reducing outdoor activities during times of poor air quality can help individuals stay informed and protect their health.
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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
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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Which statement describes a step in the formation of an ionic bond?
Answer:
Which statement describes a step in the formation of an ionic bond? An attraction occurs between two ions that have the same charge.
Explanation:
Tristan wraps some gifts and then brings them to the post office where they are delivered to people in different parts of the country. Which organelle is Tristan most like?
Answer:
Tristan wraps some gifts and then brings them to the post office where they are delivered to people in different parts of the country. Which organelle is Tristan most like?
Answer: Tristan is most like the Golgi Body
Explanation:
List the 2 pKa's for H2SO4
How do you turn the numbers
4.5 x 10^6
3.17 x 10^4
9.01 x 10^-4
8.6 x 10^-7
3.1 x 10^3
3.1 x 10^-3
7.9 x 10^6
2 x 10^1
2 x 10^-1
1.1 x 10^3
From scientific notation into standard notation.
Use the following information to answer questions 1 and 2.
Kate had a Styrofoam cooler, a plastic cooler, and an insulated bag.
insulated bag
Styrofoam™ cooler plastic cooler
She wanted to know which container would keep drinks coolest for the longest period of
time. She chilled three identical glasses of water to 40°F. Then, she placed one of the glasses
in each container and closed the containers. During the next two hours, she opened each
container every
15 minutes and measured the temperature of the water. The results of her
experiment appear on the graph below.
Results of Kate's Experiment
Temperature (°F)
inio A All
64
62
60
58
56
54
52
50
48 awon as Isla
46
44
42
40
15
30
.............
5.2C; 5.2D; 5.2G; 5.5A (H)
tadion
T
di casas
1. Which of the following could Kate
blo Fabritodistam
conclude from her results?
e
TM
45
60
75
Time Elapsed (minutes)
A All of the carriers had equal
gnis insulation. srl: looo a
Jaioa
B The water became warmer in each
ams of the containers.
C The Styrofoam cooler kept the
15qcq water coolest over two hours.
STA
D The insulated bag is the best
container for storing cool drinks.
Deplo22ib
90
105
omsins....
Styrofoam™ cooler
-
- plastic cooler
1516W insulated bag
boa gniled (A)
aldds 8
120
Insed oil O
bas? a
5.2E; 5.5A (H)
(3) 82.208.8
Answer: The Styrofoam cooler kept the water coolest over two hours.
Explanation: From the graph, it is clear that the temperature of the water in the Styrofoam cooler remained the lowest throughout the experiment, and hence, it can be concluded that the Styrofoam cooler kept the water coolest over two hours. The temperature of the water in the insulated bag and plastic cooler both increased more rapidly than in the Styrofoam cooler, indicating that they are not as effective at keeping drinks cool. Therefore, the answer is option C.
the relative formula masses (Mr) are: CaCo3 = 100; CaO =56 ; Co2=44
describe how this experiment could be used to provide evidence for the law of conservation of mass.
[6 marks]
include your answer:
-method
-which measurements should eb taken
-how the student could show evidence for the conservation for mass
The law of conservation of mass states that in a chemical reaction, the total mass of the reactants is equal to the total mass of the products. To provide evidence for this law, we can perform an experiment in which calcium carbonate (\(CaCO_3\)) is decomposed to produce calcium oxide (CaO) and carbon dioxide (\(CO_2\) ), and then measure the masses of the reactants and products.
Method:
Weigh a sample of \(CaCO_3\) using a balance.
Heat the \(CaCO_3\) in a crucible until it decomposes to CaO and \(CO_2\). The \(CO_2\) gas will escape, leaving only CaO in the crucible.
Allow the crucible to cool and then weigh it again to determine the mass of the CaO produced.
Collect the \(CO_2\) gas that is released during the reaction in a gas syringe or other collection device. Measure the volume of \(CO_2\) gas produced, and calculate its mass using its molecular weight.
Which measurements should be taken:
The following measurements should be taken:
The mass of the \(CaCO_3\) used as a reactant.
The mass of the CaO produced as a product.
The volume of \(CO_2\) gas produced during the reaction.
The temperature and pressure of the \(CO_2\) gas to allow for the calculation of its mass.
How the student could show evidence for the conservation of mass:
To show evidence for the law of conservation of mass, the student can compare the mass of the \(CaCO_3\) used as a reactant to the total mass of the products, which includes the mass of CaO produced and the mass of \(CO_2\) gas released.
The sum of the masses of CaO and \(CO_2\) should be equal to the mass of the \(CaCO_3\) used as a reactant, within experimental error. This will provide evidence that the mass of the reactants is conserved and equals the mass of the products, as required by the law of conservation of mass.
Additionally, the student could calculate the theoretical yield of CaO and CO2 based on the balanced equation for the reaction, and compare this to the actual yield obtained from the experiment. Any difference between the theoretical and actual yields could be due to experimental error, but the comparison can still provide additional evidence for the conservation of mass.
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What volume is occupied by 0.104 mol of helium gas at a pressure of 0.91 atm and a temperature of 314 K ?
Answer:
The volume will be "2.95 L".
Explanation:
Given:
n = 0.104
p = 0.91 atm
T = 314 K
Now,
The Volume (V) will be:
= \(\frac{nRT}{P}\)
By putting the values, we get
= \(\frac{0.104\times 0.0821\times 314}{0.91}\)
= \(\frac{2.6810}{0.91}\)
= \(2.95 \ L\)
Ex 1.4 You are trying to decide which of two automobiles to buy. The first is USA- made, which costs RM 85,000 and has the rated gasoline mileage of 22.5 miles/gal. The second car is a hybrid and of European manufacture, which costs RM 100,000, and has the rated mileage of 28.5 km/L. If the cost of petrol is RM 2.05/L and if the cars actually deliver their rated gas mileage, estimate how many miles you would have to drive for the lower fuel consumption of the second car to compensate for the higher cost of this car?
104895.10 kilometers need to drive for the lower fuel consumption of the second car to compensate for the higher cost of this car.
For calculating the number of miles we need the compare the cost equation of both cars.
Considering x be the number of kilometers, since the mileage of the USA-made car is (22.5 * 1.609) / 3.785 = 19.56-kilo meter per litre, and the cost of petrol per Litres = 2.05 .
SO for the USA made the pertrol cost is 2.05 / 9.56 = $0.214per km
and for the european made car is 2.05 / 28.5 = $0.071 per km
since the total cost is nothing like the sum of the purchase price and the fuel cost SO,
for the USA made , the total cost is = 85,000 + 0.214x and
for the eurpoean car is = 100,000 + 0.071x
By comparing the equation by considering the total cost for a car to be equal so
85,000 + 0.214x =100,000 + 0.071x
=>100,000- 85,000 = 0.214x- 0.071x
=>15000= 0.143x
=>x= 104895.10
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0.2g of sand in two-third in liter of ethanol . What is the concentration in g per dm cube
The mass concentration of sand in the ethanol solution is 0.299 g/dm³.
What is the concentration in grams per dm³?To find the concentration in grams per cubic decimeter (g/dm³), we first need to convert the volume from liters to cubic decimeters (dm³). Since 1 liter is equal to 1 cubic decimeter, we can directly convert the volume.
Given:
Mass of sand = 0.2 g
Volume of ethanol = two-thirds liter
Converting volume to dm³:
1 liter = 1 cubic decimeter
two-thirds liter = (2/3) cubic decimeter = 0.67 dm³ (rounded to two decimal places)
Now we can calculate the concentration in g/dm³ by dividing the mass of sand by the volume in dm³:
Concentration = Mass / Volume
Concentration = 0.2 g / 0.67 dm³
Concentration ≈ 0.299 g/dm³ (rounded to three decimal places)
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Is A fireplace poker glows red when you heat it in the fire a Chemical or
Physical change?
A fireplace poker glowing red when you heat it in the fire is referred to as a physical change.
What is Physical change?This change is a reversible one in the physical properties of a substance such as the size, color etc. Physical change doesn't alter or change the chemical composition of a substance and no new products are formed in this process.
A fireplace poker glowing red when you heat it in the fire doesn't change the composition and is reversible when allowed to cool down which is why physical change was chosen as the most appropriate choice.
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The fluoride in many toothpaste is tin (ll) fluoride produced by the reaction of tin and gaseous hydrogen fluoride.
Write this in a word and skeleton equation
Answer:
Word equation: Tin + Hydrogen fluoride → Tin (II) fluoride + Hydrogen gas
Skeleton equation: Sn + 2HF → SnF2 + H2
Please help with this one
Answer:
15g
Explanation:
hope this helped
How many moles of sulfur dioxide (SO2) are required to produce 5.0 moles of sulfur (S) according to the following balanced equation? SO2 + 2H2S - 3S + 2H2O
Answer:
1.67 moles
Explanation:
From the balanced equation of reaction:
\(SO_2 + 2H_2S -> 3S + 2H_2O\)
1 mole of sulfur dioxide, SO2, is required to produce 3 moles of sulfur, S.
If 1 mole SO2 = 3 moles S, then, how many moles of SO2 would be required for 5 moles S?
Moles of SO2 needed = 5 x 1/3
= 5/3 or 1.67 moles
Hence, 1.67 moles of SO2 would be required to produce 5.0 moles of S.
Answer: 1.7
Explanation:
Measuring Physical Properties Lab Report
Instructions: In the Physical Properties lab, you will test the physical properties of different building materials in order to pick the appropriate materials for a new home in Tiny World. Record your observations and test measurements in the lab report below. You will submit your completed report.
Shape
Name and Title:
Include your name, instructor's name,
Objective(s):
In your own words, what was the purpose of this lab?
Hypothesis:
In this section, include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
Procedure:
The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome.
Using the summary questions, clearly define the dependent and independent variables of the experiment. [Text Wrapping Break]
It can be done by only :-
I am mentioning steps to do .(Project works shouldnot be done by others or copied)
Step:-First acquire all the necessary things required for the experiment.Then do the experiment.Then write down the things which you had obtained or observed in the experiment.Then at the end write the conclusion.Answer:
Name: Construction for architecture.
Instructors name: Engineer Jason Mackel
Instruments: polymorphic clay bricks, 8 by 8 meter iron bars, 6 inch iron nails, hard glitters ground wood board, tiles and tile adhesive.
Observations:
• polymorphic clay bricks are a bit heavy but they are strong, not brittle. They stick with the adhesive applied.
• 8 by 8 iron bars are very strong with SWG > 108.
• Tile adhesive was so reluctant so we decided to put tiles aside.
Objectives:
» We got a great functionality floor which resists cracks
\(.\)
A solution is made by dissolving 38.81 grams of nickel (II) sulfate, NiSO4, in enough water to make 0.467
liters of solution. Calculate the molarity of this solution.
The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M
How do i determine the molarity of the solution?First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:
Mass of NiSO₄ = 38.81 grams Molar mass of NiSO₄ = 154.75 g/molMole of NiSO₄ = ?Mole of NiSO₄ = mass / molar mass
= 38.81 / 154.75
= 0.25 mole
Now, we shall determine the molarity of the solution. Details below:
Mole of NiSO₄ = 0.25 moleVolume of solution = 10.467 LMolarity of solution = ?Molarity of solution = mole / volume
= 0.25 / 0.467
= 0.535 M
Thus, the molarity of the solution is 0.535 M
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Which of the following is true regarding the atoms involved in a chemical reaction?