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

Options

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

Answer

C

Explanation

`C+O_(2) to CO_(2),DeltaH=-393.5kJ//mol`
`therefore`Heat released upon the formation of 44 g of `CO_(2)` ltBrgt `=-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 35.2 g of `CO_(2)`
`=(-393.5)/(44)xx35.2=-315kJ`