How do you calculate entropy change?

Answer 1

The computation of the change in entropy of a system and its surroundings after a chemical reaction at constant pressure and temperature is illustrated in this example problem.

Determine the environment's entropy in relation to the next reaction.

a.) C2H8(g) + 5 O2(g) → 3 CO2(g) + 4H2O(g) ΔH = -2045 kJ, the reaction takes place at 2#5^oC#

This reaction is exothermic, as indicated by the negative enthalpy change sign (-2045 kJ), which indicates that 2045 kJ of energy have been lost by the system to the environment.

2#5^oC# = 2#5^oC# + 273.15 = 298.15 K

ΔSsurr = ΔH /T = + 2045 kJ (encumbered heat) / 298.15 K

6.86 kJ / K is ΔSsurr.

https://tutor.hix.ai is a good example with a generic equation.

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Answer 2

Noah Aldrich

Entropy change ((\Delta S)) can be calculated using the formula:

[ \Delta S = \sum \frac{q}{T} ]

where (\Delta S) is the entropy change, (q) is the heat transferred in a reversible process, and (T) is the absolute temperature in Kelvin.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.