Ch.3 - Chemical ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: A phosphorus compound that contains 13.07% phosphorus by mass has the formula X3P2Identify the element X. Express your answer as a chemical symbol.

Solution: 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.

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.


Solution

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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