The total volume of hydrogen gas needed to fill the hindenburg was 2.09 * 108 l at 1.00 atm and 25.1°

c. how much energy was evolved when it burned?

The solution for this problem:

PV = nRT

But we are looking for n so, alter the original formula:

n = PV / RT

= (1.00 atm) x (2.09 x 10^8 L) / ((0.08205746 L atm/K mol) x (25.1 + 273.15 K))

= 8539801.26 mol H2

total volume = (8539801.26 mol H2) x (-286 kJ/mol H2) = - 2.44 x 10^9 k J