How much heat is required to heat 250 grams of water at 5 degrees Celsius?

The amount of heat required to heat water is 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 = 250 g = 0.25 kg), ∆t is the change in temperature (∆t = 5 ºС).
Let’s calculate the consumed amount of heat for heating water:
Q = C * m * ∆t = 4.2 * 10³ * 0.25 * 5 = 5250 J = 5.25 kJ.
Answer: To heat water, you need to spend 5.25 kJ of heat.