A) \[6.02\times {{10}^{24}}\]
B) \[6.02\times {{10}^{22}}\]
C) \[5.42\times {{10}^{24}}\]
D) \[5.42\times {{10}^{23}}\]
Correct Answer: C
Solution :
Number of molecules = number of moles\[\times {{N}_{A}}\] \[=\frac{180}{20}\times 6.02\times {{10}^{23}}\] (\[\because \]Mol wt. of \[{{D}_{2}}O=20\]) \[=5.42\times {{10}^{24}}\]
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