The volume occupied by 1.4g CO at S.T.P is___________________?
Correct answer: D. 1.12 dm3
- A. 22.4 dm3
- B. 2.24 dm3
- C. 1.12 cm3
- D. 1.12 dm3
Explanation
The molar mass of CO is 12 g mol-1 + 16 g mol-1 = 28 g mol-1. Thus 1.4 g ÷ 28 g mol-1 = 0.050 mol, and at STP its volume is 0.050 mol x 22.4 dm3 mol-1 = 1.12 dm3. The likely mistake is choosing 2.24 dm3 by using 0.10 mol instead of 0.050 mol.
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