Mole ConceptMedium
Question
When a certain amount of octane, C8H18, is burnt completely, 7.04 g CO2 is formed. What is the mass of H2O formed simultaneously?
Options
A.1.62 g
B.6.48 g
C.3.24 g
D.2.28 g
Solution
$C_{8}H_{18} + \frac{25}{2}O_{2} \rightarrow 8CO_{2} + 9H_{2}O$
8 × 44 g 9 × 18 g
$\therefore 7.04g \frac{9 \times 18}{8 \times 44} \times 7.04 = 3.24\text{ g}$
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