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Chemistry % composition question

by ahhppull
Tags: chemistry, composition
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Sep19-10, 05:28 PM
P: 62
1. The problem statement, all variables and given/known data

A certain metal hydroxide, M(OH)2, contains 32.8% oxygen by mass. What is the identity of the metal M?

2. Relevant equations
O = 16.00 g x2
H = 1.008 g x2

3. The attempt at a solution

I thought that 1g = 1% of the mass because there are 32g of O and it composed of 32.8% of O. So then I thought it would be around 2% of H. Then I added 32.8% + 2% and subtracted it from 100%. This was supposely my answer. I thought it was Zinc and it was wrong.
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Sep19-10, 05:35 PM
Borek's Avatar
P: 23,363
You are not completely off, but you have to do your calculations using exact value of the oxygen percentage.

Sep19-10, 06:22 PM
P: 62
oh thanks...i got the right answer now

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