Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryEnthalpy of solution/dilution/hydrationMedium2 minQB
ChemistryMediumsingle choice
Calculate the heat effect produced when a solution of 2 moles of methanol in 6 moles of water is mixed with a solution of 1 mole of methanol in 9 moles of water. Given that,
CH3OH + 3H2O → CH3OH (3H2O); ΔH = -700 cal
CH3OH + 9H2O → CH3OH (9H2O); ΔH = -1300 cal
CH3OH + 5H2O → CH3OH (5H2O); ΔH = -980 cal
Options:
Answer:
D
Solution:
First solution: 2 mol in 6 H2O = 2 × [CH3OH in 3H2O]. H1 = 2(-700) = -1400 cal. Second: H2 = -1300 cal. Initial total = -2700 cal. Final: 3 mol methanol in 15 mol water = 3 × [CH3OH in 5H2O], Hfinal = 3(-980) = -2940 cal. ΔH = -2940 - (-2700) = -240 cal, so 240 cal is released. This is option (d).
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of solution/dilution/hydration
⏱ 2mℹ️ Source: QB
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