Question

Calculate the number of molecules is 0.05g of H2O.​

Answer 1

Answer:

Molecular mass of water = 18 g

no . of molecules in 0.05 g of water = 0.05/18 = 2.78 × 10⁻³ molecules

one molecule = 6.023 × 10²³ molecules

Therefore ,

2.78 × 10⁻³ molecule of water contains = 2.78 × 10⁻³ × 6.023 × 10²³ molecules = 1.67 × 10²¹ molecules .