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#3 of thermo terms
If the heat of reaction, that is the enthalpy change AH, for a certain process is -19 kJ, that process
Select one:

3 of thermo terms If the heat of reaction that is the enthalpy change AH for a certain process is 19 kJ that process Select one class=

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xKelvin

Answer:

C

Explanation:

If the enthalpy change (i.e. ΔH) of a reaction is negative, then the reaction releases heat and is hence exothermic.

Hence, our answer is C.

Conversely, if ΔH is positive, the reaction absorbs heat and is endothermic.

ΔH tells us nothing about the speed of the reaction.

While ΔH influences free-energy change (ΔG = ΔH - TΔS), we cannot predict the sign of ΔG given only ΔH (recall that a reaction is spontaneous if ΔG < 0).

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