Write the equation and balance it. Then use this link to set up the calculation of moles N2; finally use PV = nRT to convert moles N2 at STP (from the calculation) to the conditions in the problem.
http://www.jiskha.com/science/chemistry/stoichiometry.html
What volume of ammonia at 7.0 atm and 235C would you get from 333g of nitrogen reactin with enough mass of hydrogen?k
calculate the density of hydrogen at STP?
2 answers
density H2 at STP = molar mass H2/22.4