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The enthalpies of combustion of rhombic ...

The enthalpies of combustion of rhombic sulphur and monoclinic sulphur are `-295.1` and `-296.4 kJ mol^(-1)` respectively. The enthalpy of allotropic transformation of monoclinic to rhombic sulphur is :

A

1.3 kJ

B

`-1.3 kJ`

C

`-591.5 kJ`

D

0

Text Solution

Verified by Experts

The correct Answer is:
B
(i) `S ("rhombic") + O_(2) rarr SO_(2), Delta H = - 295.1 kJ`
(ii) `S ("monoclinic") + O_(2) rarr SO_(2), Delta H = - 296.4 kJ`
`S ("monoclinic") rarr S ("rhombic") Delta H = ?`
Subtract equation (ii) from (i).
`S ("monoclinic") rarr S ("rhombic") Delta H = - 1.3 kJ`
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