The enthalpy change for chemical reaction is denoted as `DeltaH^(Theta)` and `DeltaH^
Channel: Doubtnut
Date: 2020-07-26

The enthalpy change for chemical reaction is denoted as `DeltaH^(Theta)` and `DeltaH^(Theta) = H_(P)^(Theta) - H_(R)^(Theta)`. The relation between enthalpy and internal enegry is expressed by equation:  `DeltaH = DeltaU +DeltanRT`  where `DeltaU =` change in internal enegry `Deltan =` change in number of moles, `R =` gas constant.   For the change, `C_("diamond") rarr C_("graphite"), DeltaH =- 1.89 kJ`, if `6g` of diamond and `6g` of graphite are seperately burnt to yield `CO_(2)` the heat liberated in first case is