Problem: A phosphorus compound that contains 13.07% phosphorus by mass has the formula X3P2. Identify the element X. Express your answer as a chemical symbol.

🤓 Based on our data, we think this question is relevant for Professor N/A's class at Ryerson University.

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We’re being asked to determine the element in the phosphorus compound with a formula of X3P2.


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


Recall the mass percent formula:

% mass=mass componenttotal mass×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.

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Problem Details

A phosphorus compound that contains 13.07% phosphorus by mass has the formula X3P2

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


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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mass Percent Formula concept. You can view video lessons to learn Mass Percent Formula. Or if you need more Mass Percent Formula practice, you can also practice Mass Percent Formula practice problems.

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor N/A's class at Ryerson University.