The enthalpy of combustion of carbon to carbondioxide is`- 393.5 kJ "mol"^(-1)` . Calculate , the heat released upon the formation of 35.2g of `CO_2` from carbon and oxygen gas.

Explanation

The cumbustion of carbon is given by
` C(s) + O_2 (g) to CO_2 (g) " " Delta H = - 393.5 kJ "mol"^(-1)`
Number of mol of `CO_2 = (35.2)/(44) = 0.8`
Amount of heat evolved in the formation of 0.8 mol of `CO_2` is ` = 393.3 xx 0.8 = 314.8 kJ `