Which of the following would weigh the highest?
(a) 0.2 mole of sucrose (C₁₂H₂₂O₁₁)
(b) 2 moles of CO₂
(c) 2 moles of CaCO₃
(d) 10 moles of H₂O

Correct Answer: (c) 2 moles of CaCO3

Explanation: The molecular mass of C₁₂H₂₂O₁₁ is = 12(12) + 22(1) + 11(16) gm = 342 gm

0.2 moles of it weigh = 0.2 x 342 gm = 68.4gm

The molar mass of CO₂ is = 12 + 2(16) gm = 44gm

2 moles of it weigh = 2 x 44 = 88gm

The molar mass of CaCO₃ weigh = 40 + 12 + 3(16) = 100gm

2 mole of it weigh = 2 x 100 gm = 200gm

Molar mass of H₂O is = 2(1) + 16 = 18gm

10 mole of it weigh = 10 x 18 gm = 180gm

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Updated on: 19-Jan-2023

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