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    				| 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» 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` | |