In the combustion of octane (C8H18) fuel, the rate of production of steam was measured to be 7.4 moles/minutes.
The balanced equation for reaction of complete
combustion of octane is
2C8H18 + 25O2
→ 16CO2 + 18H2O
For 7.4 mol/min of water steam to be produced it is
necessary to consume 7.4×25/18
= 10.3 mol of O2 per
minute or, equivalently, 10.3 mol * 32.00 g/mol = 330 g of O2
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