Problem: Which gas sample has the greatest volume at STP?a) 10.0 g Arb) 10.0 g Krc) 10.0 g Xed) None of the above (They all have the same volume.)

FREE Expert Solution

Recall that standard temperature and pressure (STP) is defined as 1 atm and 0°C. 

PV=nRTPVP=nRTPV=nRTP

R is constant, P and T are the same for all → compare the number of moles for each

↑ moles (n) = ↑ volume


a) 10.0 g Ar

molar mass Ar = 39.95 g/mol

moles Ar=10.0 g×1 mol39.95 g

moles Ar = 0.250 mol


b) 10.0 g Kr

molar mass Kr = 83.798 g/mol

moles Kr=10.0 g×1 mol83.798 g

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Problem Details

Which gas sample has the greatest volume at STP?
a) 10.0 g Ar
b) 10.0 g Kr
c) 10.0 g Xe
d) None of the above (They all have the same volume.)

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