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The heat of transition of S(alpha) into ...

The heat of transition of `S_(alpha)` into `S_(beta)` is +2.5 kJ. The heat of combustion of monoclinic sulphur is `- 300 kJ mol^(-1)`. Calculate heat of combustion of rhombic sulphur`(S_(alpha))`.

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`S _(alpha ) to S _(beta) , Delta H = + 2.5 kJ and S _(beta) + O _(2 (g)) to SO _(2 (g)) , Delta H =- 300 kJ`
Adding these two, the heat of combustion of `Salpha` is obtained. `S _(alpha ) + O _(2 (g)) to SO_(2 (g)) , Delta H =- 297.5KJ.`
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