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