How do you solve this problem? Please help!!! Thanks!?

Question

What the molecular formula if the formula mass is 34amu and it's empirical formula is HO? Thanks for all your help!

Answer 1

The atomic weight of H=1 and O=16.

Since the mass is 34 AMU, that's twice the weight of the empirical formula (16+1=17, 34/17=2). So the empirical formula (which really only identifies the ratio of the elements) is for only half the molecule. Double the counts in the empirical formula:

H2O2