Part AHow many moles of Kr(g) are there in 0.680 L of the gas at 0.762 atm and 25 °C?Express your answer with the appropriate units.?НА3D иValueUnitsDYou have already submitted this answer. Enter a new answer.No credit lost. Try again.Previous Answers Request AnswerSubmit

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Asked Oct 18, 2019
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Part A
How many moles of Kr(g) are there in 0.680 L of the gas at 0.762 atm and 25 °C?
Express your answer with the appropriate units.
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Part A How many moles of Kr(g) are there in 0.680 L of the gas at 0.762 atm and 25 °C? Express your answer with the appropriate units. ? НА 3D и Value Units DYou have already submitted this answer. Enter a new answer. No credit lost. Try again. Previous Answers Request Answer Submit

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Expert Answer

Step 1

For a given chemical species, the number of moles can be defined to the ratio of mass to the molar mass. The mathematical formula which is used to calculate the number of moles is as follows:

Mass
Number of moles-.
Molar mass
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Mass Number of moles-. Molar mass

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Step 2

The ideal gas law that is also known as the equation of state is an equation of state of a hypothetical ideal gas. The equation can be written as shown below:

PV=nRT
P is the pressure of the gas
V is the volume of the gas
n is the number of moles
T is the temperature of the system
R is the gas constant
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PV=nRT P is the pressure of the gas V is the volume of the gas n is the number of moles T is the temperature of the system R is the gas constant

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Step 3

The volume of the Kr in the gas is given to be 0.680 L.

T=25oC=298 K

P= 0.762 at...

PV=nRT
PV
RT
0.762 atmx0.680 L
n=
0.0821 L atm K mol1x298 K
-0.0211 mol
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PV=nRT PV RT 0.762 atmx0.680 L n= 0.0821 L atm K mol1x298 K -0.0211 mol

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