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प्रश्न
Calculate the standard enthalpy of the reaction, 2C(graphite) + 3H2(g) → C2H6(g), ΔH° = ?
From the following ΔH° values
a) `C_2H_6(g) + 7/2 O_2(g) -> 2CO_2(g) + 3H_2 O(l)`. ΔH° = -1560kJ
b) `H_2(g) + 1/2 O_2 (g) -> H_2O(l)` ΔH° = -285.8kJ
c) C(graphite) + O2(g) -> CO2(g). ΔH° = -393.5kJ
उत्तर
Given: Given equations are,
`C_2H_6(g) + 7/2 O_2(g) -> 2CO_2(g) + 3H_2 O(l)`. ΔH° = -1560kJ ....(1)
`H_2(g) + 1/2 O_2 (g) -> H_2O(l)` ΔH° = -285.8kJ ......(2)
C(graphite) + O2(g) -> CO2(g). ΔH° = -393.5kJ.......(3)
To find: Standard enthalpy of the given reaction
Calculation: Reversing equation (1),
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