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