State which of the following statements is true ?
1. First law of thermodynamics is not adequate in predicting the direction of the process.
2. In an exothermic reaction, the total enthalpy of the products is greater than that of reactants.
3. The standard enthalpy of diamond is zero at 298 K and 1 atm pressure.
4. It is possible to calculate the value of for the reaction from the bond enthalpy data.
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