1.

The standard enthalpy of combustion of formaldehyde Delta_(c)H^(@)=-571kJ. How much heat will be evolved in the formation of 22 g of CO_(2) ?

Answer»

Solution :Enthalpy of COMBUSTION of formaldehyde
`CH_(2)O_((g))+O_(2((g))rarr CO_(2(g))+H_(2)O((g))`
`Delta_(c)H^(@)=-571kJ`
`"Molar of "CO_(2)=("Mass of "CO_(2))/("Molar mass of "CO_(2))`
`=(22)/(44)=(1)/(2)=0.5`
`therefore""` Heat evolved in the formation of 0.5 MOLES of
`CO_(2)=-571xx0.5 =-285.5kJ`


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