How much bituminous coal must be burned to release 216 MJ of heat

univerkov | May 10, 2021 | education

How much bituminous coal must be burned to release 216 MJ of heat (specific heat of combustion of fuel is kg q = 27 MJ)?

Initial data: Q (heat released during combustion of coal) = 216 MJ = 216 * 10 ^ 6 J.

Reference data: according to the condition q (specific heat of combustion of coal) = 27 MJ / kg = 27 * 10 ^ 6 J / kg.

The mass of coal used can be expressed from the formula: Q = q * m and m = Q / q.

Let’s calculate: m = 216 * 10 ^ 6 / (27 * 10 ^ 6) = 8 kg.

Answer: It will be necessary to burn 8 kg of coal.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.