Chapter 5, Problem 5.6E

The following is a reaction with its initial conditions (amounts of each substance):

$\begin{array}{l}{\text{6H}}_{\text{2}}+{\text{P}}_{\text{4}}\to {\text{4PH}}_{\text{3}}\\ \text{10}\text{.0}\text{mol}3.\text{0}\text{mol}3.\text{5}\text{mol}\end{array}$

(a) Determine $\xi$ if $\text{1}\text{.5}\text{mol}$ of ${\text{P}}_{\text{4}}$ reacts to make products.

(b) Is it possible for $\xi$ to equal $3$ in this case? Why or why not?