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Calculate the amount of (NH(4))SO(4) in ...

Calculate the amount of `(NH_(4))SO_(4)` in grams which must be added to 500 ml of 0.200 M `NH_(3)` to yield a solution with pH = 9.35 (`K_(b)` for `NH_(3) = 1.78 xx 10^(-5)`)

A

10.56 gm

B

15 gm

C

12.74 gm

D

16.25 gm

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