MCAT Chemistry Question — Molar Heat Capacities
- Feb 04, 2017
- MCAT Question of the Day
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Molar heat capacity tells you how much energy (J) is necessary to increase one mole of a substance by 1 K. Therefore, the higher the molar heat capacity, the more energy required. In the question above, gold has the highest molar heat capacity and therefore requires the greatest amount of heat. The calculations are given below.
Energy = (molar heat capacity) x (# of moles) x (change in temperature)
Zinc: (25.2 J/mole K) x (1 mole) x (10 K) = 252 J
Copper: (24.5 J/mole K) x (1 mole) x (10 K) = 245 J
Silver: (24.9 J/mole K) x (1 mole) x (10 K) = 249 J
Gold: (25.6 J/mole K) x (1 mole) x (10 K) = 256 J
Multiplying the molar heat capacity by the number of moles and the change in temperature gives you energy required. Gold requires the most heat (256 J) making answer choice D correct.
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