How much peat needs to be burned to release the amount of heat equal to 7 gj; 49 gj

Initial data: the released amount of heat Q1 = 7 GJ (7 * 10 ^ 9 J) and Q2 = 49 GJ (49 * 10 ^ 9 J).

Reference values: q (specific heat of combustion of peat) = 1.4 * 10 ^ 7 J / kg.

1) 7 GJ of heat was released: m1 = Q1 / q = 7 * 10 ^ 9 / (1.4 * 10 ^ 7) = 500 kg.

2) 49 GJ of heat was released: m2 = Q2 / q = 49 * 10 ^ 9 / (1.4 * 10 ^ 7) = 3500 kg or 3.5 tons.

Answer: To obtain 7 GJ and 49 GJ of heat, it will be necessary to burn 500 kg and 3.5 tons of peat, respectively.



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