A) $ 0.5\times 10^{23} $
B) $ 1.5\times 10^{23} $
C) $ 3.5\times 10^{23} $
D) $ 2.5\times 10^{23} $
Correct Answer: B
$ 17,gmNH_3 $ = 1 mole. Molecules of $ NH_3=\frac{6.02\times 10^{23}\times 4.25}{17}=1.5\times 10^{23} $
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