1.

Determine the mass of the following : (i) 6.022 xx 10^(23) number of O_(2) molecules (ii) 6.022 xx 10^(23) number of O atoms .

Answer»

Solution :(i) The NUMBER of moles = `("number of MOLECULAR")/("Avogadro constant") = (6.022 xx 10^(23))/(6.022 xx 10^(23)) = 1`.
Now , mass = mole `xx` molecular mass = `1 xx 32 = 32` G
(ii) The number of moles `= ("number of atoms")/("Avogadro constant") = (6.022 xx 10^(23))/(6.022 xx 10^(23)) = 1` .
Now , mass = mole `xx` atomic mass = `1 xx 16 = 16` g


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