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
Solution :
\[17\,gm\,\,N{{H}_{3}}\]= 1 mole. Molecules of \[N{{H}_{3}}=\frac{6.02\times {{10}^{23}}\times 4.25}{17}=1.5\times {{10}^{23}}\]
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