Chapter 5, Problem 23QP

Consider this reaction:

$\begin{array}{l}2{\text{CH}}_{\text{3}}\text{OH}\left(l\right)+3{\text{O}}_2\left(g\right)\to 4{\text{H}}_{\text{2}}\text{O}\left(l\right)+2{\text{CO}}_2\left(g\right)\\ \Delta H=-1452.8\text{kl/mol}\end{array}$

What is the value of $\Delta H$ if (a) the equation is multiplied throughout by 2; (b) the direction of the reaction is reversed so that the products become the reactants, and vice versa; (c) water vapor instead of liquid water is formed as the product?