A: Formaldehyde, CH₂O, can be made from methanol by the following reaction, using a copper catalyst. 

CH₃OH(g) → CH₂O(g) + H₂(g)

If 25.7 g CH₂O(g) is produced per mole of methanol that reacts, what are 

(a) The theoretical yield; 

(b) The actual yield; and 

(c) The percent yield?

(B) What is the percent yield if the reaction of 25.0 g P₄ and 91.5 g Cl₂ produces 104 g PCl₃? The balanced chemical equation for the reaction is given below.

P₄(s) + 6 Cl₂(g) → 4 PCl₃(l)