Calculate the ?h for the following reaction: co (g) + 2 h2 (g) = ch3oh (g)

Using Hess’s law and the following reactions:

2c (s) + o2(g) = 2co (g) ?h = - 221.0 kj 2c (s) + o2 (g) + 4h2 (g) = 2ch3oh (g) ?h = -402.4 kj