The enthalpy of combustion of octane, C8H18, one of the major components of gasoline, is 5463 kJ/mole or 48 kJ/g. The density of octane is 0.70g/mL.
If your chemistry teacher's car requires approximately 10 L of octane in order to travel 100 km, how much energy does it require to travel 100 km?
2007-11-07 23:52:44 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics
E = 48kJ/g * 0.7g/ml * 1000ml/L * 10L = 336000kJ
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2007-11-07 23:59:21 · answer #1 · answered by The Wolf 6 · 0⤊ 0⤋
The previous people got it right. A simple rule of thumb. If you know that the answer has to end in Joules then all the other parameters must somehow cancel out. Doesn't always apply but sometimes can give you some insight.
2007-11-08 08:28:11 · answer #2 · answered by Natureboy 1 · 0⤊ 0⤋
10 L/100 km * 0.70 g/mL * 1000 mL/L * 48 kJ/g =
336,000 kJ/100 km or
336 MJ/100 km
2007-11-08 08:00:05 · answer #3 · answered by gebobs 6 · 0⤊ 0⤋