Chemistry
Which of the following would weigh the most?
- 1 mole of H2O
- 1 mole of CO2
- 1 mole of NH3
- 1 mole of CO
Mole Concept
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Answer
1 mole of CO2
Reason — Since each molecule is 1 mole, the weight depends entirely on molar mass.
| Molecule | Molecular Mass |
|---|---|
| H2O | 1 x 2(H) + 16(C) = 18 g/mol |
| CO2 | 12(c) + 16 x 2(O) = 44 g/mol |
| NH3 | 14(N) + 1 x 3(H) = 17 g/mol |
| CO | 12(C) + 16(O) = 28 g/mol |
So, 1 mole of CO2 has molecular mass of 44 g/mol, hence, weigh the most.
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