Why is the enthalpy of sublimation equal...

Why is the enthalpy of sublimation equal to the sum of enthalpy of fusion and enthalpy of vaporisation ?

Answer

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Enthalpy of reaction is equal to

`sum` Bond of energies of reactants -`sum` Bond of energies of products.

`sum` Bond of energies of reactants + `sum` Bond of energies of products.

`(sum " Bond of energies of reactants ")/(sum " Bond of energies of product")`

None of these

Enthalpy of element is equal to the

`Delta_c H^@`

`Delta_r H^@`

`Delta_fH^@`

All

Standard enthalpy of reaction is equal to

Standard enthalpies of formation of products + Standard enthalpies of formation of reactants.

Standard enthalpies of formation of products - Standard enthalpies of formation of reactants. Standard enthalpies of formation of products

`("Standard enthalpies of formation of products")/("Standard enthalpies of formation of reactants")`