Worksheet: Heat in Mixed Systems

In this worksheet, we will practice calculating masses, temperature changes, and specific heats in systems containing two or more phases or materials.


A steel fuel tank contains 14.0 L of diesel oil with a density of 0.832 g/cm3. The heat capacity of the steel is 0.502 J/g⋅K, while that of the diesel oil is 2.05 J/g⋅K.

The tank is cooled from 5 0 . 0 C to 2 0 . 0 C , releasing 1.67 MJ of energy. To the nearest kg, what is the mass of the steel tank when empty?

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