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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. = 252)

A

`1.4xx10^(22)`

B

`1xx10^(23)`

C

`6xx10^(23)`

D

`7xx10^(23)`

Text Solution

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The correct Answer is:
B
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