Question

In: Chemistry

What does scalar multiplication do to a reaction? What about delta H? What does the inverse...

What does scalar multiplication do to a reaction? What about delta H?

What does the inverse transformation do? What about delta H?

Solutions

Expert Solution

Scalar Multiplication:

Consider a chemical reaction: A + B => C + D

It has delta H = x (let)

After multiplying the equation with a scalar quantity "a", the reaction becomes

aA + aB => aC + aD

and the delta H = a*(x)

This is because, delta H = Summation of (coefficients*product) - Summation of (coefficients*reactant)

So, as well multiply by scalar quantity, the coefficient which was initially one changes to "a" in every compound. So, overall a becomes common in the equation and can be written as a*(x).

Inverse Transformation:

Inverse transformation of the old reaction is D + C => B + A

So, now the initial reactants became products and vice versa. So, in the formula of delta H, the products will now take place the value of reactants and so does reactants. So, basically, there will be a sign inversion in delta H. If initially delta H = +ve, after inverse transformation delta H = -ve.


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