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Thermodynamics question

2022 · 24 Jun · Shift 2 · Q4
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  5. /2022 · 24 Jun · Shift 2 · Q4

Thermodynamics question

2022 · 24 Jun · Shift 2 · Q4

JEE MainChemistryThermodynamicsMCQ+4 / −1

At 25 ∘^\circ∘ C and 1 atm pressure, the enthalpies of combustion are as given below :

Substance H2{H_2}H2​ C (graphite) C2H6(g){C_2}{H_6}(g)C2​H6​(g)
ΔcHΘkJ mol−1{{{\Delta _c}{H^\Theta }} \over {kJ\,mo{l^{ - 1}}}}kJmol−1Δc​HΘ​ −286.0- 286.0−286.0 −394.0- 394.0−394.0 −1560.0- 1560.0−1560.0

The enthalpy of formation of ethane is

  1. A
    +54.0 kJ mol −-− 1
  2. B
    −-− 68.0 kJ mol −-− 1
  3. C
    −-− 86.0 kJ mol −-− 1
  4. D
    +97.0 kJ mol −-− 1
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