A 2.21-kg piece of copper metal is heated from 20.5°C to 126.4°C. Calculate the heat absorbed (in kilojoules) by the metal.

The heat absorbed by the metal is 91.27 kJ.

Explanation:

This is a sort of excersise about calorimetry which formula is:

Q = m. C. ΔT

where Q = heat

where m = mass

where C = Specific heat

ΔT = T° final - T° initial

You can find specific heat in tables, if you don't know it. It is generally given in the statement unless, you have to find it out.

Specific heat for copper is 0.390 kJ/kg.°K

Notice that units in specific heat are in °K, but it is the same K or C.

The difference doesn't change the sense of units. We can use °C.

Q = 2.21 kg. 0.390 kJ/kg.°K (126.4°C - 20.5°C)

Q = 91.27 kJ