Change in Enthalpy Calculator, Formula, Joules Calculation

Change in Enthalpy Calculator:

Enter the values of change in internal energy, ∆U_(J), constant pressure, P_(Pa), change in volume, ∆V_(m3) to determine the value of Change in enthalpy, ∆H_(J).

Change in Enthalpy Formula:

Change in enthalpy, ∆H_(J) in joules is calculated by summing the change in internal energy, ∆U_(J) in joules, constant pressure, P_(Pa) in Pascals and then multiply by the change in volume, ∆V_(m3) in cubic metres.

Change in enthalpy, ∆H_(J) = ∆U_(J) + P_(Pa) * ∆V_(m3)

∆H_(J) = change in enthalpy in joules, J.

∆U_(J) = change in internal energy in joules, J.

P_(Pa) = constant pressure in Pascals, Pa.

∆V_(m3) = change in volume in cubic metres, m³.

Change in Enthalpy Calculation:

1. Finding Change in Enthalpy:

Given: ∆U_(J) = 500J, P_(Pa) = 101.3k.Pa, ∆V_(m3) = 0.002m³.

Change in enthalpy, ∆H_(J) = ∆U_(J) + P_(Pa) * ∆V_(m3)

∆H_(J) = 500 + 101.3 * 10³ * 0.002

∆H_(J) = 500 + 202.6

∆H_(J) = 702.6J.

2. Finding Change in Internal Energy:

Given: ∆H_(J) = 1500J, P_(Pa) = 101.3k.Pa, ∆V_(m3) = 0.003m³.

Change in enthalpy, ∆H_(J) = ∆U_(J) + P_(Pa) * ∆V_(m3)

∆U_(J) = ∆H_(J) – P_(Pa) * ∆V_(m3)

∆U_(J) = 1500 – 101.3 * 10³ * 0.003

∆U_(J) = 1196.1J.

Calculating Enthalpy Change: