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

Options

A. `+135` kJ
B. `-31.5` kJ
C. `-315` kJ
D. `+31.5` kJ

Answer

C

Explanation

`C+O_(2)to CO_(2)`
`DeltaH=-393.5kJ`
`therefore` Heat released upon the formation of 1 g of
`CO_(2)=(-393.5)/(44)kJ`
`therefore` Heat released upon the formation of 1 g of
`CO_(2)=(-393.5)/(44)xx35.2`
`~~-315kJ`