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The mass of N(2)F(4) produced by the ...

The mass of `N_(2)F_(4)` produced by the reaction of 2.0 g of `NH_(3)` and 8.0 g `F_(2)` is 3.56 g. What is the per cent yield ?

A

79

B

71.2

C

84.6

D

None of these

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