# Chem 151

A solution of ammonia and water contains 3.50×10^25 water molecules and 5.00×10^24 ammonia molecules. How many total hydrogen atoms are in this solution?

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1. Molecular formula for water: H2O
Molecular formula for ammonia: NH3

1 H2O molecule has 2 H atoms
1 NH3 molecule has 3 H atoms

3.50 * 10^25 H2O molecules * 2 H atoms/H20 molecule = 7 * 10^25 H atoms for the water part of the solution

5.00 * 10^24 NH3 molecules * 3 H atoms/NH3 molecule = 1.5*10^25 H atoms for the ammonia part of the solution

7 * 10^25 H atoms from water + 1.5 * 10^25 H atoms from ammonia = 8.5 * 10^25 total H atoms

(it's a bit late so my math might be slightly off, but that's the gist of it. I think you can handle plugging in the numbers)

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2. 23, 54

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