Explain with an example how the amount of heat imparted to a body when it heats up or released

Explain with an example how the amount of heat imparted to a body when it heats up or released when it cools is calculated.

Let one liter of the code with a temperature of 20 ° C be brought to a boil. Let us calculate the amount of heat required for this heating Q = mc (t1 – t2) where m = 1 kg is the mass of heated water, c = 4200 J / kg * ° С specific heat capacity of water, t2 is the boiling point, t1 = 20 ° С initial water temperature.
It is better to check the units in advance:
kg * J / kg * ° C = J
and in the formula, indicate the unit of measurement of the result:
Q = 1 * 4200 * (100-20) = 4200 * 80 = 336000 = 336 * 10 (power 3) J = 336 kJ.