Hydrogen holds promise as an environment friendly fuel. How many grams of H2 gas are present in a 52.0 L fuel tank at a pressure of 2861 lb/in2 (psi) at 20.0°C? Assume that 1 atm = 14.7 psi.

Answer 1

PV=nRT=grams*RT/2

grams= 2*PV/RT
change pressure to 2861*101.4/14.7 kpa
change temp to kelvins
then compute grams, using the appropriate R