4 what is the net amount of heat released when two moles of c2h6(g) are formed from its elements at 101.3 kpa and 298 k?

Enthalpy of formation is defined as the heat change that is needed for formation of one mole of substance from its constituent elements in pure state.

In present case, Heat of formation of one mole of C2H6 at 101.3 kpa and 298 k is -84 kJ/mol. Negative sign indicates that, heat is evolved from the system.

Thus, for two mole of ethane, heat of formation will be 2 X (-84) = -168 kJ/mol.

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aliasger2709 aliasger2709 · Answer 2 · 2022-06-24T13:26:46+02:00

When 2 moles of ethane are formed from their elements at 298 Kelvin then 168 kJ/ mol of heat is released during the reaction.

What is enthalpy?

Enthalpy is the amount of heat lost or released and gained by the reactants of the reaction system to split or form the products.

As it is known, 1 Atm = 101.3 KPa, and at this pressure, the enthalpy of formation of ethane is -84 kJ/mol. Then, at the formation of 1 mole of ethane molecule the energy is released, and hence the energy will be in positive.

Then for 2 moles of ethane molecule, 2 × 84 kJ/mol = 168 kJ/mol of heat will be released.

Therefore, 168 kJ/mol is the net amount of heat that will be released.

Learn more about enthalpy here:

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