A) \[6.023 \times \,\,1{{0}^{22}}\]
B) \[1.338 \times \,\,1{{0}^{22}}\]
C) \[6.023 \times 1{{0}^{20}}\]
D) \[7.338 \times 1{{0}^{22}}\]
Correct Answer: B
Solution :
Mass of a drop of water \[= 0.05 \times 1 g = .05 e\] No. of moles of water \[=\,\,\frac{.05}{18}\] No. of water molecules \[=\,\,\,\frac{0.5}{18}\,\,\times \,\,6.023\,\,\times \,\,{{10}^{23}}\] water molecule contains 8 neutrons \[\therefore \,\,\,\,\,\,\,\frac{.05}{18}\,\,\times \,\,6.023\,\,\times \,\,{{10}^{23}}\,\,molecule\,\,contains\,\,\frac{0.05\times 8}{18}\]\[\times \text{ }6.023\,\,\times \,\,{{10}^{23}}\,neutrons\] \[\,=.1338\,\,\times \,\,{{10}^{23}}\] \[\,=1.338\,\,\times \,\,{{10}^{22}}\]
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