Question

A sample of carbon dioxide has a volume of 20.0 L. How many moles of gas must be in the sample, if you know the gas is being held at STP?

Answer 1

Answer:

In order to solve this problem we would use the Ideal Gas Law formula PV=nRT

P= Pressure in atm

V= Volume in L

n= moles

R= Ideal Gas Law Constant

T= Temp in K

STP is Standard Temperature and Pressure which has values of

1atm and 273K

2.34gCO2 must be converted to moles

2.34gCO2x1mol44gCO2=0.053mols

P=1atm

V=???L

n=0.053mols

R=0.0821atmLmolK

T=273K

PV=nRT becomes

V=nRTP

V=0.053mols(0.0821atmLmolK)