Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryEnthalpy of ReactionEasy2 minPYQ_2020
ChemistryEasysingle choice

The standard enthalpies of formation ofCO2(g),H2O(l)and glucose (s) at25°Care−400  kJ/mol,−300 kJ/moland−1300 kJ/mol, respectively. The standard enthalpy of combustion per gram of glucose at25°Cis

Options:

Answer:
C
Solution:

C 6 H 12 O 6 +6 CO 2 →6 O 2 +6 H 2 O
CO2→-400kJ/mol
H2O=-300kJ/mol
Glucose=-1300kJ/mol
ΔH=ΔHP-ΔHR=6ΔHf(CO2)+6Hf(H2O)-ΔHf(C6H12O6)
=6×-400+6-300--1300=-2400-1800+1300=-2900kJ/mol
ΔH=-2900180=-16.11kJ/g

Stream:NTA_ABHYAS_NEETSubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Reaction
⏱ 2mℹ️ Source: PYQ_2020

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