1.

Which of the following expresion is true ?

Answer»

`Delta_(f)H^(@)(CO, g)=(1)/(2)Delta_(f)H^(@)(CO_(2),g)`
`Delta_(f)H^(@)(CO, g)= Delta_(f)H^(@)` (C, GRAPHITE) `+(1)/(2)Delta_(f)H^(@)(O_(2),g)`
`Delta_(f)H^(@)(CO, g)=Delta_(f)H^(@)(CO_(2), g)-(1)/(2)Delta_(f)H^(@)(O_(2), g)`
`Delta_(f)H^(@)(CO, g)=Delta_(c )H^(@)` (C, graphite) `- Delta_(c )H^(@)(CO, g)`

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