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# Help please? Show steps as well?

What mass of hydrogen atoms are in 185 g of zinc hydroxide: Zn(OH)2 (Mw. 99.43)?

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- KennyBLv 72 months agoFavorite Answer
1) Figure out how many moles of H you have. Divide 185 by the molecular weight of Zn(OH)2. Now multiply by 2 because there are 2 H's in even mole of Zn(OH)2 (Note: answer is something short of 4 moles of H)

2) Now multiply by the atomic weight of H (about 1 g/mole). So about 4 g of H

3) Remember to use at least three significant figures in all calculations.

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