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Chemical reactions usually have enthalpy change

Enthalpy change, H, is the heat energy transferred in a reaction, at constant pressure.

You write it like this, Ho to show that the elements were under standard states and that
measurements were made under standard conditions. Standard conditions are 100kPa (1 atm)…

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Standard enthalpy change of reaction, Hor, is the enthalpy change when a reaction occurs under
molar quantities shown in the equation in its standard state under standard conditions.

Measuring enthalpy changes in labs.

To measure the enthalpy change of a reaction, you need to know the number of moles in…


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