1.

If the heat of formation of CO_(2) is -393 kJ. The amount of heat evolved in the formation of 0.156 kg of CO_(2) is

Answer»

`-1357.9`kJ
`-1275.9` kJ
`-1572.0` kJ
`-1165.5` kJ

Solution :Heat of formation of a SUBSTANCE is the heat exchanged when one MOLE of that substance is FORMED by its constituent elements.
`because` Heat evolved when 1 mole (44g) `CO_(2)` is formed
`=(393xx156)/(44)`
`therefore DELTAH` for the process = 1572 kJ =-1572.0 kJ`.


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