A jet plane carrying 3,000 kg of ethane burns off all the...
A jet plane carrying 3,000 kg of ethane burns off all the gas forming water and carbondioxide. if all the carbondioxide is expelled and all the water formed is condensed and kept on board the plane, then the gain in weight is
1,800 kg
900 kg
600 kg
2,400 kg
1,200 kg
Correct answer is D
2C2H6+7O2→4CO2+6H2O
addition of oxygen causes weight gain, expelled CO2 results in weight loss
for oxygen added;
2moles C2H6 = 7moles O2
2(30)g C2H6 = 7(2)(16)g O2
3000kg C2H6 = X kg O2
cross multiplying X = 11200kg
for CO2 expelled;
2moles C2H6 = 4moles CO2
2(30)g C2H6 = 4(44)g CO2
3000kg C2H6 = Y kg CO2
cross multiplying Y = 8800kg
since X > Y, the plane has a net weight gain.
Net weight gain = X - Y = 11200-8800 = 2400kg.
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