How much heat is required to heat 0.1 kg water per 1 ° C?

The consumed amount of heat can be calculated using the formula:
Q = C * m * ∆t, where Q is the amount of heat expended for heating water (J), C is the specific heat capacity of water (C = 4.2 kJ / (kg * K) = 4.2 * 10³ J / (kg * K)), m is the mass of water (m = 0.1 kg), ∆t is the change in water temperature (∆t = 1 ºС).
Let’s calculate the consumed amount of heat for heating water:
Q = C * m * ∆t = 4.2 * 10³ * 0.1 * 1 = 420 J.
Answer: It is necessary to spend 420 J of heat.