A body weighing 4.5 kg was heated from 20 to 42 (degrees). At the same time, he was told an amount of heat equal

A body weighing 4.5 kg was heated from 20 to 42 (degrees). At the same time, he was told an amount of heat equal to 49.5 kJ. What substance is the body made of?

The substance from which the body is made, we can find out if we find its heat capacity (“c”), then look at the table of substances and their heat capacities. We use the formula to find the amount of heat.
Q = cm (t2-t1).
Since we need “c”, we express “c” from the formula for the amount of heat.
Then, c = Q / m * (t2-t1)
Converting from kJ to J = 49500 J
Substitute, 49500 / 4.5 * (42-20) = 500 J or 0.5 kJ