Additionally, a study of the concentration of A with respect to time (seconds) showed that only a plot of 1/[A] vs. time gave a straight line relationship. What will the half-life of this reaction be when the initial concentration of the solution is 0.368 M at 278 K

1.solid

2.carbon dioxide

3.helium

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.