1.

Oxidation ofpropane isrepresented as C_(3)H_(8_((g))) + 50_(2_((g))) to 3CO_(2_((g)))+ 4H_(2)O_((g)) DeltaH^(@) =- 2043 kJ How muchpressurevolumework is doneand whatis thevaluneof DeltaU at constantpressureof 1 atmwhen thevolumechangeis +22.4 L

Answer»


Solution :Given :`Delta H^(@)=-2043 KJ`
Change in volume`= Delta V = + 22.4 L`
`Delta U = ?`
`C_(3)H_(8_((g)) + 5O _(2_((g))) to3CO_(2_((g)))+ 4H_(2)O_((g))`
`Delta n =(n_(2))_("gaseous products ") - (n_(1))_("gaseous reactants ")`
`= (3 + 4)- (1+5)`
`= 1"mol" `
Sincethere is theanincrease in NUMBEROF moles the workwill beofexpansion .
`W=- P xx Delta V`
`=- 1 xx 22.4 L atm`
`=-1 xx 22.4 xx 101.3 J`
`=- 2270 J`
`=- 2.27 kJ`
`Delta H = Delta U + PDelta V`
`:.Delta U = Delta H- P Delta V`
`=- 2043- (2.27 )`
`=- 2045 .27 kJ`


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