Q. For The Reaction : C3 - ​ - H8 - ​ - (g)+5O2 - ​ - (g)→3CO2

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4. For the reaction: C 3 H 8( g )+5 O 2( g ) arrow 3 CO 2( g )+4 H 2 O (ℓ) at constant temperature, Δ H - Δ E is :

Q. For the reaction : C3​H8​(g)+5O2​(g)→3CO2​(g)+4H2​O(ℓ) at constant temperature, ΔH−ΔE is : 1795 283 AIPMTAIPMT 2003Thermodynamics Report Error A

+ RT

16% B

- 3RT

51% C

+ 3RT

19% D

- RT

14%

Solution:

For the reaction, C3​H8​(g)+5O2​(g)​3CO2​(g)+4H2​O(ℓ) Δn = number of gaseous moles of products - number of gaseous moles of reactants =3−6=−3 ∴ΔH−ΔE=ΔnRT OR ΔH−ΔE=ΔnRT ∴ΔH−ΔE=−3RT