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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
The standard enthalpy of formation $(\Delta _fH^o)$ at $298\, K$ for methane, $CH_4(g)$ is $-74.8 \,kJ \,mol^{-1}.$ The additional information required to determine the average energy for $C- H$ bond formation would be
  • A
    the first four ionization energies of carbon and electron gain enthalpy of hydrogen
  • B
    the dissociation energy of hydrogen molecule, $H_2$
  • ✓
    the dissociation energy of $H_2$ and enthalpy of sublimation of carbon
  • D
    latent heat of vapourization of methane
✓

Answer

Correct option: C.
the dissociation energy of $H_2$ and enthalpy of sublimation of carbon
c
The standard enthalpy of formation of $C H_{4}$ is given by the equation:

$C(s)+2 H_{2}(g) \rightarrow C H_{4}(g)$

Hence, dissociation energy of hydrogen and enthalpy of sublimation of carbon is required.

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