How much heat is needed to heat 200 g of iron from 10C to 40C degrees Celsius?

Initial data: m (weight of iron taken) = 200 g (0.2 kg); t0 (initial temperature of iron) = 10 ºС; t (final temperature) = 40 ºС.

Reference data: according to the condition Сж (specific heat capacity of iron) = 460 J / (kg * ºС).

The required amount of heat for heating the taken iron is determined by the formula: Q = Czh * m * (t – t0).

Let’s make the calculation: Q = 460 * 0.2 * (40 – 10) = 460 * 0.2 * 30 = 2 760 J (2.76 kJ).

Answer: To heat the taken iron, 2.76 kJ of heat is needed.