What mass of firewood was burned if 50 * 10 ^ 6 J of energy was released?

These tasks: Q (the amount of thermal energy from the combustion of the desired mass of firewood) = 50 * 10 ^ 6 J.

Reference values: q (specific heat of combustion of dry wood) = 10 * 10 ^ 6 J / kg.

To determine the burnt mass of firewood, we will use the formula: m = Q / q.

Let’s calculate: m = 50 * 10 ^ 6 / (10 * 10 ^ 6) = 5 kg.

Answer: The required mass of burnt dry firewood is 5 kilograms.