When octane burns in an automobile engine, heat is released to the air and to the metal in the car engine, but a significant portion is absorbed by the liquid in the cooling system- an aqueous solution of ethylene glycol. What mass of octane is complete burned to cause the heating if 20 kg of aqueous ethylene glycol automobile from 10 degree Celsius to 70 degree Celsius? The specific heat capacity of the aqueous ethylene glycol is 3.5 J/g.C. Assume water is produced as a gas ad that all the heat flows into the coolant.

Question

aaronq · Answer

same ol' formula:   q=mCdT

do this for the coolant (ethylene glycol) solving for q.

then you'd have to know the heat produced per gram of octane fuel, do you know this value?