Problem: Given w = 0, an endothermic reaction has which of the following:a. +ΔH and +ΔEb. -ΔH and -ΔEc. +ΔH and -ΔEd. -ΔH and +ΔE

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We’re being asked to determine the signs of ΔH and ΔE given w = 0 and that the reaction is endothermic.


Work is given by the equation:

w=-PV

When work is equal to 0, there’s no change in volume or the volume is constant.


For ΔH, recall endothermic and exothermic reactions:

Exothermic reactions

lose energy, releases heat, the temperature of the surroundings increases
▪ involves bond formation (for phase change: gas → liquid → solid)
ΔH is negative

Endothermic reactions

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Problem Details

Given w = 0, an endothermic reaction has which of the following:

a. +ΔH and +ΔE

b. -ΔH and -ΔE

c. +ΔH and -ΔE

d. -ΔH and +ΔE

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