The heat of combustion of carbon to `CO_(2)`is`-395.5kJ//mol`.The heat released upon the formation of`35.2g` of`CO_(2)`from carbon and oxygen gas is

Options

A. `-630KJ`
B. `-3.15KJ`
C. `-315KJ`
D. `+315KJ`

Answer

D

Explanation

Formation of `CO_(2)` from carbon and dioxygen gas can be represented as
`C(s)+O_(2)(g)rarrCO_(2(g)),Delta_(f)H=-393.5KJmol^(-1)`
`(1"mole"=44g)`
Heat released on the formation of `44gCO_(2)`
`=-393.5KJmol^(-1)`
`=(-393.5KJmol^(-1))/(44g)xx35.2g=-315KJ`