In the following options which one is maximum/highly exothermic reaction..?

1)SrO+h2o
2)BaO+h2o
3)CaO+h2o
4)MgO+h2o
Pls.... Need it real quick

cao + h20

To determine which reaction is the most exothermic, we need to compare the enthalpy of the reactions. The enthalpy change (∆H) of a reaction indicates if the reaction is exothermic (negative ∆H) or endothermic (positive ∆H).

To find the enthalpy change for each reaction, you need to look up the enthalpies of formation (∆Hf) of the products and subtract the enthalpies of formation of the reactants.

Fortunately, there are standard tables available that provide the enthalpies of formation for most common substances. By using these values, you can calculate the enthalpy change for each reaction and compare them.

Let's calculate the enthalpy changes for each reaction:

1) SrO + H2O -> Sr(OH)2:
Assuming the enthalpy of formation for Sr(OH)2 is -944 kJ/mol and the enthalpies of formation for SrO and H2O are known, you can subtract the enthalpies of formation of the reactants from the enthalpy of formation of the product to find ∆H.

2) BaO + H2O -> Ba(OH)2:
Repeat the same process as above, but with the appropriate enthalpy values for BaO, H2O, and Ba(OH)2.

3) CaO + H2O -> Ca(OH)2:
Once again, use the enthalpy values for CaO, H2O, and Ca(OH)2 to calculate ∆H.

4) MgO + H2O -> Mg(OH)2:
Finally, calculate ∆H using the enthalpies of formation for MgO, H2O, and Mg(OH)2.

Compare the ∆H values for each reaction. The reaction with the most negative (largest in magnitude) ∆H value is the most exothermic.

Please note that without the specific enthalpy values, it is not possible to determine the most exothermic reaction from the given options.