Chemistry - Chemical Equilibrium Question with Solution | TestHub
ChemistryChemical EquilibriumEffect of temperatureEasy2 minQB
ChemistryEasysingle choice
For the reaction: SrCl2·6H2O(s) ⇌ SrCl2·2H2O(s) + 4H2O(g); Δ H = 6720 cal. The dissociation pressure is 2×10-3 atm at 27°C. What will be the dissociation pressure at 127°C? (ln 2 = 0.7)
Options:
Answer:
C
Solution:
Kp = (PH2O)4 and the dissociation pressure is PH2O Take R = 2 cal/mol/K, T1 = 300 K and T2 = 400 K
ln(K2/K1) = (Δ H)/R(1/300 - 1/400) = 6720/2×1/1200 = 2.8
2.8 = 4ln 2, so K2/K1 = 16
(P2/P1)4 = 16 so P2 = 2P1 = 2×2×10-3
P2 = 4.0×10-3 atm
This is option (c).
Stream:JEESubject:ChemistryTopic:Chemical EquilibriumSubtopic:Effect of temperature
⏱ 2mℹ️ Source: QB
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