6.4 g of CHOH burns completely in excess oxygen. What mass of water is produced? (H = 1, C = 12, O = 16)
Answer and explanation
Correct answer: C. 7.2 g
- Step 1: Molar mass of CHOH g/mol, so moles mol.
- Step 2: Each mole gives 2 mol of HO, i.e. g.
Answer
7.2 g.
Why not the others: 8.8 g: that is the mass of the other product. 14.4 g: it doubles the correct value. 6.4 g: the mass of fuel is repeated.
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