Chemistry % composition question

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Homework Statement



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

Homework Equations


O = 16.00 g x2
H = 1.008 g x2

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.
 

Answers and Replies

  • #2
Borek
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You are not completely off, but you have to do your calculations using exact value of the oxygen percentage.

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  • #3
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oh thanks...i got the right answer now
 

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