A sample of gas at 310 Kelvin and 1.2 atmospheres has a density of 2.78 g/L. What is the molar mass of this gas? PLEASE EXPLAIN HOW YOU GOT YOUR ANSWER

1 answer
Question:

A sample of gas at 310 Kelvin and 1.2 atmospheres has a density of 2.78 g/L. What is the molar mass of this gas?
PLEASE EXPLAIN HOW YOU GOT YOUR ANSWER

Answers

ideal gas law PV = nRT    or  PM = dRt ( M is molecular mass of gas ) and d is gas density where m/ M    ( m is mass of gas sample ) m = dRT / P  ( 2.78 g/L )   ( 0.082 L atm/ K mole )( 310K )  /  1.2 atm  = 58.9 g/molgas must be butane ( C4H10) has molecular mass = 58.9 g/mol

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