P4 +6Br2 --> 4PBr3 What is the ratio of the moles of P4 consumed to moles of PBr3 produced?

Explanation:

To find the mole ratio, we must use the coefficients.

This equation is balanced (4 atoms of P and 12 atoms of Br on both sides), so we can go straight to the coefficients.

So according to the coefficients above, for every 1 mole of P₄ that is consumed, 4 moles of PBr₃ are produced. Therefore, the ratio is 1 mole P₄ to 4 moles of PBr₃.