Question -
What is the mass of 4.82 x 1025 molecules of H2O in grams?
Options:
A .  1440 g
B .  1280 g
C .  160 g
D .  1600 g
Answer: Option A : A Number of moles of water =Total number of moleculesAvogadro constant=4.82×10256.022×1023=80 Therefore, mass of water= Number of moles×Molecular Mass =80×18=1440.71 g
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