Answer to Question #86521 in General Chemistry for Jim

Question

What is the energy change when the temperature of 10.9 grams of solid aluminum is decreased from 36.7 degrees celsius to 20.0 degrees celsius

Answer 1

The specific thermal capacity of Al is $c = 0.902~\frac{\text{J}}{\text{g}\cdot\degree\text{C}};$

${\Delta}Q = cm{\Delta}t = 0.902~\frac{\text{J}}{\text{g}\cdot\degree\text{C}}~*~10.9~\text{g}~*~(36.7-20.0)~\degree\text{C} \approx 164.19~\text{J}.$