Q13 of 62 Page 68

Enthalpy of sublimation of a substance is equal to

Reason: Sublimation is the process of conversion of solid into vapor.

Solid now can be also first converted into the liquid which require enthalpy of fusion and then it will be converted into vapor which require enthalpy of vapourization.

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Consider the reactions given below. On the basis of these reactions find out which of the algebric relations given in options (I) to (iv) is correct?

(a) C (g) + 4 H (g) → CH4 (g); ΔrH = x kJ mol–1


(b) C (graphite, s) + 2H2 (g) → CH4 (g); ΔrH = y kJ mol–1


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The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound

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Which of the following is not correct?

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Thermodynamics mainly deals with