Question

What is the value of H?

Answer 1

Enthalpy:

• The enthalpy of a system is represented by ‘H’.
• Enthalpy of a substance is defined as the energy stored in a substance and which is available for conversion in heat is known as enthalpy or heat content of a substance.
• Enthalpy change of a system is defined as the heat gained or lost by the system at constant pressure.
• The formula for the calculation of enthalpy change can be represented as: $∆\mathrm{H}=∆\mathrm{U}+\mathrm{P}∆\mathrm{V}$, where$∆\mathrm{H}$ is the change in enthalpy, $∆\mathrm{U}$ is the change in internal energy, P is the pressure, and $∆\mathrm{V}$ is the volume.
• The unit of enthalpy is $\mathrm{kJ}{\mathrm{mol}}^{-1}$