A) 20
B) 40
C) 60
D) 80
Correct Answer: B
Solution :
Key Idea : Moles of water \[=\frac{Mass\text{ }of\text{ }water}{Molecular\text{ }mass\text{ }of\text{ }water}\] Given, mass of water = 720 g Molecular mass of water = 2 + 16 = 18 Moles of water \[=\frac{720}{18}=40\]
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