Multiconcept Exercise 10.72 An ideal gas sample occupies a container of volume 0

Question

Multiconcept Exercise 10.72 An ideal gas sample occupies a container of volume 0.75 L at STP. Part A Find the number of moles in in the sample. Express your answer using two significant figures. n 3.3x10 mol Submit My Answers Give Up Correct Part B Find the number of molecules in in the sample. Express your answer using two significant figures. N 22 molecules Submit My Answers Give Up Correct Part C If the gas is carbon monoxide (CO), What is the sample's mass? Express your answer using two significant figures. m E Submit My Answers Give U Incorrect, Try Again; 2 attempts remaining Provide Feedback Continue

Explanation / Answer

V = 0.75 L = 0.00075 m^3

at STP

pressure P= 1atm

T = 0oC = 273 K

part A:

from ideal gas equation

PV = nRT

101325*0.00075 = n*8.314*273

n = 0.034

Part B:

N/Na = n

N = 0.034*6.023*10^23

N = 2.1*10^22

part C:

molar mass of CO = 12 +16 = 28 g/mol

m/M = 0.034

m = 28*0.034

m = 0.952 g

m = 0.95 g

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