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The molar heat capacity, Cm of gold (Au(s)) is 25.4 J K-1 mol-1. Calculate the energy (in J) required to heat a 100 g bar of gold from 25 °C to 75 °C?
- A. 127000
- B. Not possible to calculate
- C. 645
- D. 1
For SI units, molar capacity (symbol Cn) is the quantity of energy in joules needed to raise the temperature of one mole of a substance to 1 Kelvin. Cn = Q / ΔT in which Q represents the heat, and ΔT is the temperature change. In most cases it is reported as an inherent property which means that it is a characteristic of a specific material. The measurement of heat capacity is done using the calorimeter.
C. 645