When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation

The correct answer is Option 1.

Explanation:

We are given two intermediate equations and a final net equation for the formation of calcium carbonate. To form a net equation, we have to apply some operations on the second equation.

Two intermediate equations given are:

To get the final equation, we will half the second equation and reverse the equation, we get:

Equation 1:      

Equation 2:      

Net Equation:    

Hence, the correct answer is Option 1.

the product of the pressure and volume is also constant