A) \[25\]
B) \[100\]
C) \[50\]
D) \[100\times 6\times {{10}^{-23}}\]
Correct Answer: A
Solution :
Number of atom of a substance = Number of gram molecular weight \[\times 6.02\times {{10}^{23}}\times atomicity\] \[\text{=}\frac{\text{weight}\,\,\text{of}\,\,\text{substance}}{\text{number}\,\,\text{of}\,\,\text{gram}\,\,\text{molecules}}\text{ }\!\!\times\!\!\text{ 6}\text{.02 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{23}}}\] \[\times \,\,atomicity\] \[=1\,\,amu=1.6\times {{10}^{-24}}g\] \[100\,\,amu=1.6\times 100\times {{10}^{-24}}g\] \[=\frac{100\times 1.6\times {{10}^{-24}}}{4}\times 6.023\times {{10}^{23}}\times 1\] \[=25\times 1.6\times {{10}^{-24}}\times 6.023\times {{10}^{23}}=25\]
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