Chemistry - Chemical Equilibrium Question with Solution | TestHub
ChemistryChemical EquilibriumEffect of temperatureMedium2 minQB
ChemistryMediummultiple choice
Van't Hoff equations show the effect of temperature on equilibrium constants KC and KP. For a reaction with enthalpy change Δ H and internal energy change Δ U, the correct relations between values at T1 and T2 are
Options:(select one or more)
Answer:
A, D
Solution:
The Van't Hoff equation is given by:
ln(KP2)/(KP1) = (ΔH)/(R)((1)/(T1) - (1)/(T2)) = (ΔH)/(R)(T2 - T1)/(T1 T2)
Inverting the ratio changes the sign, so:
log(KP1)/(KP2) = (ΔH)/(2.303R)((T1 - T2)/(T1 T2))
Therefore, option (a) is correct and option (b) is incorrect.
For KC, the same derivation uses ΔU:
log(KC2)/(KC1) = (ΔU)/(2.303R)((T2 - T1)/(T1 T2))
Thus, option (c) has the wrong sign.
Inverting the ratio for KC gives:
log(KC1)/(KC2) = (ΔU)/(2.303R)((T1 - T2)/(T1 T2))
Therefore, option (d) is correct.
The correct options are (a) and (d).
Stream:JEESubject:ChemistryTopic:Chemical EquilibriumSubtopic:Effect of temperature
⏱ 2mℹ️ Source: QB
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