Step 1: 2A⟶B+C slow Step 2: B+C⟶E fast Overall: 2A⟶E Determine the rate law for the overall reaction, where the overall rate constant is represented as .

Explanation:

Steps mention in question are as follow.

Step 1: 2A <> B ( fast)

Step 2: B + C > D (slow)

Overall: 2A + C > D

The slowest step is as follows

2A <> B

Since the rate law is written as concentrations of reactants raised to power their stoichiometric coefficient multiplied by rate constant. Thus, rate law for this reaction can be written as follow.

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.