# [SOLVED] Given the values of ΔH∘rxn, ΔS∘rxn, and T below, determine ΔSuniv.?

Given the values of ΔH∘rxn, ΔS∘rxn, and T below, determine ΔSuniv.?

Update:

ΔH∘rxn=− 84 kJ , ΔSrxn= 155 J/K , T= 395 K

After my calculations I got -58 J/K but still wrong. Can you please show me where the mistake is? Thank you!

selected by

## This is the Best answer for Given the values of ΔH∘rxn, ΔS∘rxn, and T below, determine ΔSuniv.?

ΔSsurroundings = -ΔH∘rx/T

ΔSsurroundings = +84 kJ/ 395 K = 0.213 kJ/K = 212 J/K

ΔSuniverse = ΔSsystem + ΔSsurroundings

ΔSuniverse = 213 J/K + 155 J/K = 368 J/K

I believe that you probably kept the negative sign on ΔH when calculating ΔSsurroundings. Because the reaction is exothermic, that heat will increase the entropy of the surroundings, and so must have a positive value.

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat.