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Values of heats of formation for SiO(2) ...

Values of heats of formation for `SiO_(2)` and `MgO` are `-48.4` and `-34.7 kJ` respectively. The heat of the reaction `2Mg+SiO_(2)rarr2MgO+Si` is

A

21.0 kJ

B

`-21.0`kJ

C

13.7 kJ

D

`-13.7`kJ

Text Solution

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The correct Answer is:
B
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