Register to reply

Chemistry % composition question

by ahhppull
Tags: chemistry, composition
Share this thread:
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.
Phys.Org News Partner Science news on
Scientists discover RNA modifications in some unexpected places
Scientists discover tropical tree microbiome in Panama
'Squid skin' metamaterials project yields vivid color display
Sep19-10, 05:35 PM
Borek's Avatar
P: 23,716
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

Register to reply

Related Discussions
Empircal composition question Biology, Chemistry & Other Homework 4
A question involving self-composition. Calculus 2
Percent Composition and Finding Formula - Chemistry Biology, Chemistry & Other Homework 3
Percent Composition & Finding Formula - Chemistry Biology, Chemistry & Other Homework 3
Chemistry in the Real World - Super Quick Question on chemistry/pools Biology, Chemistry & Other Homework 1