Question

A solution of ammonia and water contains 4.70×1025 water molecules and 7.80×1024 ammonia molecules. How many total hydrogen atoms are in this solution?

Answer 1

Chemical formula of water : H₂O

Chemical formula of ammonia : NH₃

molecules of water = 4.70 x 10²⁵ molecules

atoms of hydrogen from water = (molecules of water) * (number of hydrogen atoms in one molecule of water)

atoms of hydrogen from water = (4.70 x 10²⁵ molecules) * (2 atoms / molecule)

atoms of hydrogen from water = 9.40 x 10²⁵ atoms

molecules of ammonia = 7.80 x 10²⁴ molecules

atoms of hydrogen from ammonia = (molecules of ammonia) * (number of hydrogen atoms in one molecule of ammonia)

atoms of hydrogen from ammonia = (7.80 x 10²⁴ molecules) * (3 atoms / molecule)

atoms of hydrogen from ammonia = 2.34 x 10²⁵ atoms

Total atoms of hydrogen = (atoms of hydrogen from water) + (atoms of hydrogen from ammonia)

Total atoms of hydrogen = (9.40 x 10²⁵ atoms) + (2.34 x 10²⁵ atoms)

Total atoms of hydrogen = 1.17 x 10²⁶ atoms