1.

How many formula units are there in a 42 gsample of (NH_4)_2Cr_2O_7(formula wt.=252g) ?

Answer»

`7.0 xx 10^23`
`1.0 xx 10^23`
`6.0 xx 10^23`
`1.4 xx 10^22`

Solution :FORMULA units of `(NH_4)_2 Cr_2O_7`
` = (6.02 xx 10^23)/(252) xx 42 = 1.0 xx 10^23`


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