Question

The dirigible Hindenburg had 3.7E6 m3 of hydrogen in its gas bags at 1.1 atm and 7°C. What was the weight of the hydrogen in pounds?

Answer 1

http://en.wikipedia.org/wiki/Gas_constant

you need to solve for n and convert to pounds.
PV = nRT => n = (PV)/(RT) where P is pressure in atm, V is Volume is in m^3, T is in degrees Kelvin and R = 8.205746×10−5 (m^3 * atm)/(K*mol)

Answer 2

once you have moles, you should be able to convert to pounds. Remember, hydrogen is diatomic.