The heat of combustion of carbon to `CO_(2)` is -393.5 kJ/mol. The heat released for the formation of 35.2 g of `CO_(2)` from carbon and oxygen gas is:``

Options

A. `-630` kJ
B. `-3.26` kJ
C. `-315` kJ
D. `+315` kJ

Answer

C

Explanation

Heat of combustion of carbon to `CO_(2)` = Heat of formation of `CO_(2)` = -393.5 kJ mol
Heat released for forming 1 mol (44g) of `CO_(2) = -393.5 kJ `
Heat released for formation of 35.2 g of
`CO_(2) = (-393.5 xx 35.2)/(44)`
` = -314.8`
or = `- 315 kJ`