A) \[{{10}^{-3}}N\]
B) \[{{10}^{-2}}N\]
C) \[{{10}^{-1}}N\]
D) \[10N\]
Correct Answer: A
Solution :
Given, weight of water\[=18\text{ }mg=18\times {{10}^{-3}}g\] \[\therefore \] Number of moles\[=\frac{weight}{molar\,mass}\] \[=\frac{18\times {{10}^{-3}}}{18}=1\times {{10}^{-3}}\] and number of molecules = no. of moles\[\times \] Avogadro number. \[=1\times {{10}^{-3}}\times N\] \[={{10}^{-3}}N\]
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