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Heats of formation of SiO(2) and MgO are...

Heats of formation of `SiO_(2)` and `MgO` are `-48.24` and `-34.7` kJ respectively. The heat of the reaction : `2Mg+SiO_(2) rarr 2MgO+Si` is

A

21.64 KJ

B

`-21.16` KJ

C

`-13.62` KJ

D

13.62 KJ

Text Solution

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The correct Answer is:
B
`DeltaH=H_(p)-H_(R)`
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