Answer to Question #168070 in General Chemistry for Javon Joseph

Question

A 27 g aluminum foil pan is used to roast vegetables. The pan is put into a cold oven at 22 ^oC .  How much energy in cal is absorbed by the pan after cooking at 232 ^oC (450. ^oF) for 25 minutes?

Answer 1

25 minutes is enough for the pan to get to 232^oC. So we have initial (22^oC) and final (232^oC) temperatures. Aluminium specific heat capacity is 0.215 cal/g/^oC at 25^oC (this is a table value and let's assume it doesn't change with temperature).

Then, energy absorbed Q = 27*0.215*(232-22) = 1219.05 cal.