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How many formula units are there in a 42...

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

A

`7.0 xx 10^23`

B

`1.0 xx 10^23`

C

`6.0 xx 10^23`

D

`1.4 xx 10^22`

Text Solution

Verified by Experts

The correct Answer is:
B
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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