If the combustion of 1 g of graphite produces 20. 7 kJ of heat, what will be molar enthalpy change ? Give the significance of sign also.

If the combustion of 1 g of graphite produces 20. 7 kJ of heat, what w

1.	If the combustion of 1 g of graphite produces 20. 7 kJ of heat, what will be molar enthalpy change ? Give the significance of sign also.
Answer» SOLUTION :Enthalpy of combustion of 1 G graphite= 20.7 kJ Molar enthalpy change for the combustion of graphite `DELTA H = ` enthalpy of combustion of 1g graphite `xx` molar mass `Delta H = - 20.7 "kJ g"^(-1) xx 12 "g mol"^(-1)` `Delta H = - 2.48 xx 10^(2) "kJ mol"^(-1)` Negative sign in the value of `Delta H` indicates that the reaction is exothermic.