Question

A solution of ammonia and water contains 1.80×1025 water molecules and 7.00×1024 ammonia molecules. How many total hydrogen atoms are in this solution?

Answer 1

In N H 3 : 3 Hydrogen + 1 Nitrogen atom

`3 * 7 * 10 ^(24)= 21 * 10^(24) = 2.1 * 10 ^(25)`
In H 2 O : 2 Hydrogen + 1 Oxygen atom

`2 * 1.8 * 10 ^(25) = 3.6 * 10 x^(25)`
Total Hydrogen atoms:

`2.1 * 10 ^(25) +3.6 * 10 ^(25) = 5.7 * 10 ^(25)`