1.

Determine the mass of the following : (i) 0.7 mole of O_(2) gas (ii) 0.7 mol of O atoms .

Answer»

Solution :(i) Molecular mass of `O_(2) ` GAS = 32
`therefore ` mass = MOLE `XX` molecular mass = `0.7 xx 32 = 22.4` G
(ii) Atomic mass of O atom = 16
`therefore` mass = mole `xx` atomic mass = `0.7 xx 16 = 11.2` g .


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