Question

Calculate the no of molecules in drop of water weighing 0.36g

Answer 1

The molecular weight of H2O = 18

Thus, 18 grams of H2O = 1 mol of H2O

36 grams of H2O = 2 mol of H2O

1 mol of H2O = 6.023* 10^23 molecules of H2O

2 mol of H2O = 2*6.023*10^23 molecules of H2O

= 12.046 * 10^23 molecules of H2O