[Boxxxed]

A 4.65 g sample of an oxide of copper, when heated in a stream of hydrogen, produces Cu(s) and 0.585 g H2O. What is formula for the compound?

a.Cu2O
b.CuO
c.CuO2
d.Cu2O3
e.Cu3O4

I don't remember doing any problem like this. The only lead I have it that it has something to do with the ratios of the masses and moles. Been looking at it for a while and can't figure it out. Any help to get started would be appreciated

[Borek]

How much oxygen in water?

[Cherriyan]

According to my calculations, the answer is xxx

[Borek]

According to my calculations, the answer is xxx

Doing homework for others is strictly against forum rules. Have you read them?

[rabolisk]

First, write the reaction out. You don't know the formula of copper oxide, but you do know that it is in the form of Cu(m)O(n) where m and o are some integer subscripts. You are given the mass of H2O, which means that you can figure out the mole of H2O, which allows you to figure out more things. Approach it step by step, and you'll have the answer.