The units commonly used for molar enthalpy are which?

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Multiple Choice

The units commonly used for molar enthalpy are which?

Explanation:
Molar enthalpy is the heat content per amount of substance, so its units must express energy per mole. That’s why J/mol or kJ/mol are used. They show how much energy corresponds to one mole of material. If you had 2 moles with a molar enthalpy of 40 kJ/mol, the total enthalpy change would be 80 kJ, illustrating why the per-mole form is important. Using J or kJ alone would give energy without tying it to how much substance is present, and J/kg would be energy per mass, not per mole, which is a different quantity (specific enthalpy).

Molar enthalpy is the heat content per amount of substance, so its units must express energy per mole. That’s why J/mol or kJ/mol are used. They show how much energy corresponds to one mole of material. If you had 2 moles with a molar enthalpy of 40 kJ/mol, the total enthalpy change would be 80 kJ, illustrating why the per-mole form is important. Using J or kJ alone would give energy without tying it to how much substance is present, and J/kg would be energy per mass, not per mole, which is a different quantity (specific enthalpy).

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