How may molecules are in .20 moles of H2O

Answer 1

0.2 moles H₂O x 6.02x10²³ molecules/mole = 1.204x10²³ molecules = 1.2x10²³ molecules (to 2 significant figure)

Answer 2

1 mole contains - 6.023 x 10²³ molecules

0.2 moles ------------ ??

No of moles in 0.2 = 0.2 x 6.023x10²³ = 1.2046 x 10²³