Explain the standard enthalpy of combustion Delta_(C) H^( Theta).

1.	Explain the standard enthalpy of combustion Delta_(C) H^( Theta).
Answer» Solution :When the enthalpy change per mole of a substance undergoes combustion and all the reactants and products are in their standard states at the specified temperature is known as standard enthalpy of combustions. e.g., Cooking gas in cylinders CONTAINS mostly butane `(C_(4) H_(10) )`. We can write the thermochemical reactions for this as : `C_(4) H_(10(g)) + (13)/(2) O_(2(g)) to 4CO_(2(g)) + 5H_(2) O_((I)): Delta_(R) H^( Theta) = -2658.0 "kj/mol"` Combustion of GLUCOSE, `C_(6) H_(12) O_(6(g)) to 6 CO_(2(g)) + 6H_(2) O_((I)), Delta_(r) H^( Theta)=-2802.0 "kj/mol"`

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