# How many moles of P4 are needed to react with 9 moles of Mg? 6 Mg + P4 → 2 Mg3P2

##### 1 Answer

Jul 1, 2014

Let us look at the equation;

6Mg +

according to this equation 1 mole of

1 mole of

X moles of

X moles of

the two ratios are equal.

(a) = (b)

1 mole of

X moles of

- 1 = X .6

6X = 9

X = 9/6 = 3/2 = 1.5 mole