# Chemical Engineering Help With Calculation Enthalpy Changes

## 3.8 Calculation Enthalpy Changes:

There are two methods basically – using equations and using ratios.

Q - total enthalpy change

n – no. of moles

∆H – molar enthalpy of substance in the reaction

**Using ratios:**

Since the heat released or absorbed in any phase, chemical and nuclear change is directly proportional to the molar enthalpy change in the equation, ratios can be used to solve problems involving heat and the amount of substance.

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