Question

calculate the mass of 12.044 molecules of oxyzen

Answer 1

massof 1 mole of 02 molecules = 32 grams

1  mole of 02 contain 6.022 x 10²³ molecules,

so mass of 1 molecule of o2 = 32÷ (6.022 x 10²³)

mass of 12.044 molecules= 12.044 x { 32 ÷(6.022 x 10²³)}

                                           = 64 ÷ 10²³= 6.4 x 10^ (-22) grams

hope it helps:)