1.

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

Answer»

21.16 kJ
`-21.16 kJ`
13.62 kJ
`-13.62 kJ`

SOLUTION :`Delta H = 2 Delta H_(F) (MgO) + Delta H_(f) (Si) - 2 Delta H_(f) (Mg) - Delta H_(f) (SiO_(2))`
`= 2 xx 34.7 + 0 - 2 xx 0 - 48.24`
= 21.16


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