Chapter 5, Problem 70E

The following reactions can be used to prepare samples of metals. Determine the enthalpy change under standard state conditions for each.

(a) $2{\text{Ag}}_2\text{O}\left(s\right)\to 4\text{Ag}\left(s\right)+{\text{O}}_2\left(g\right)$

(b) $\text{SnO}\left(s\right)+\text{CO}\left(g\right)\to \text{Sn}\left(s\right)+{\text{CO}}_2\left(g\right)$

(c) ${\text{Cr}}_2{\text{O}}_3\left(s\right)+3{\text{H}}_2\left(g\right)\to 2\text{Cr}\left(s\right)+3{\text{H}}_2\text{O}\left(l\right)$

(d) $2\text{Al}\left(s\right)+{\text{Fe}}_2{\text{O}}_3\left(s\right)\to {\text{Al}}_2\text{O}\left(s\right)+2\text{Fe}\left(s\right)$