5.8 g of CH burns completely in excess oxygen. What mass of water is produced? (H = 1, C = 12, O = 16)
Answer and explanation
Correct answer: B. 9 g
- Step 1: Molar mass of CH g/mol, so moles mol.
- Step 2: Each mole gives 5 mol of HO, i.e. g.
Answer
9 g.
Why not the others: 17.6 g: that is the mass of the other product. 18 g: it doubles the correct value. 5.8 g: the mass of fuel is repeated.
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