120 KJ of heat is absorbed in this reaction.
As we know
Where W is the provided mass of carbon, which is 30g, n=W/M
M is the carbon molar mass. 30 / 12 = 2.5 moles at 12g/mol.
As a result, the heat absorbed by 2.5 moles of carbon is equal to 120 kJ, or half the heat absorbed by 5 moles of carbon, or 239.9 kJ.
The heat evolved (either emitted or absorbed) during a process that runs at constant pressure is equivalent to the change in enthalpy. The internal energy (U) and pressure-volume product (PV), are both supplied by the equation:
H=U+PV
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