What Is the Metal in M(OH)2 with 32.8% Oxygen by Mass?

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SUMMARY

The metal in the hydroxide M(OH)2, which contains 32.8% oxygen by mass, is determined to be Magnesium (Mg). The calculations involve using the molar mass of oxygen (16.00 g/mol) and hydrogen (1.008 g/mol) to derive the mass of the metal. The initial assumption of Zinc was incorrect, as the calculations must be precise to identify the correct metal based on the given percentage of oxygen.

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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.
 
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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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oh thanks...i got the right answer now
 

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