A sample of a compound with nitrogen and hydrogen has 7.207g N and 1.037g H. Molar mass of compound is 32 g. What is its molecular formula?
I tried this and my answer was N4H8 but I was incorrect. Anyone know how to do this?
- Bobby_ThinLv 72 months ago
moles of N in your sample = 7.207g / 14 g/mol = 0.515 moles
moles of H = 1.037g / 1.004 g/mol = 1.033 moles
molar ratio N:H = 0.514: 1.033 or 1:2
empirical formula is the molar ratio of the elements or NH2
empirical formula mass = 16 g (14+2)
molar mass is given as 32 g / mole so there are 2 empirical formula mass units / mol of your compound
so 2 * NH2 = N2H4 ..
- KennyBLv 72 months ago
N4H8 has a molar mass of 72 - your answer should be N2H4