Asolution of ammonia and water contains 1.50×10^25 water molecules and 8.20×10^24 ammonia molecules. how many total hydrogen atoms are in this solution?

In order to compute the total hydrogen atoms present, we must first write the molecular formulas of ammonia and water to know how many hydrogen atoms are present in each molecule.

Water - H₂O; so 2 hydrogen atoms per molecule of water

Ammonia - NH₃; so 3 hydrogen atoms per molecule of ammonia

Total hydrogen atoms = 2 * molecules of water + 3 * molecules of ammonia

H atoms = 2 * 1.5 x 10²⁵ + 3 * 8.2 x 10²⁴
H atoms = 5.46 x 10²⁵

There are a total of 5.46 x 10²⁵ hydrogen atoms in the solution

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water