What is the mass in grams of : (i) `6.022 xx 10^(23)` atoms of oxygen
(ii) `1.0 xx 10^(23)` molecules of `H_(2)S`
(iii) `6.022 xx 10^(23)` molecules of oxygen ?

Answer

(i) 16 g (ii) 5.645 g (iii) 32 g

Explanation

(i) `6.022 xx 10^(23)` atoms of oxygen have mass =16.0 g
`6.022xx 10^(23)` molecules of `H_(2)S` have mass = 34.0 g
`1.0 xx 10^(23)` molecules of `H_(2)S` have mass `= (34.0xx10^(23))/(6.022xx10^(23))=5.645g`
(iii) Mass of `6.022 xx 10^(23)` molecules of oxygen `(O_(2))=32g`