We’re being asked to determine the element in the phosphorus compound with a formula of X_{3}P_{2}.

We are given the mass percent of phosphorus which is 13.7%.

Recall the **mass percent formula**:

$\overline{){\mathbf{\%}}{\mathbf{}}{\mathbf{mass}}{\mathbf{=}}\frac{\mathbf{mass}\mathbf{}\mathbf{component}}{\mathbf{total}\mathbf{}\mathbf{mass}}{\mathbf{\times}}{\mathbf{100}}}$

We’re going to **determine the identity of X **using the following **steps**:

*Step 1**. Determine the mass of P and mass of X. Step 2. Calculate moles of X.Step 3. Calculate the molar mass of X.Step 4. Determine the identity of X.*

**Step 1. Determine the mass of P and mass of X.**

A phosphorus compound that contains 13.07% phosphorus by mass has the formula X_{3}P_{2}.

Identify the element X. Express your answer as a chemical symbol.

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