A) \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\]
B) \[\text{3}.\text{45 }\times \text{ 1}{{0}^{\text{25}}}\]
C) \[\text{55}.\text{4 }\times \text{ 1}{{0}^{\text{23}}}\]
D) \[\text{18 }\times \text{ 1}{{0}^{\text{23}}}\]
Correct Answer: B
Solution :
Number of water molecules in one litre of pure water \[=\]molarity of water\[\times \]Avogadro's number \[=55.4\times 6.023\times {{10}^{23}}\] \[=3.45\times {{10}^{25}}\]
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