section 7.3 percent composition of a compound here’s were the math starts to get fun!!!
TRANSCRIPT
Section 7.3Percent Composition of a
Compound
Here’s were the math starts to get fun!!!
Calculating the Percent Composition of a Compound
1. The relative amounts of each element in a compound are expressed as the percent composition, or the percent by mass of each element in a compound.
Example:
Calculating the Percent Composition of a Compound
1. The relative amounts of each element in a compound are expressed as the percent composition, or the percent by mass of each element in a compound. Example: An 8.20 gram piece of magnesium combines completely with 5.40 grams of oxygen gas to form a compound. What is the percent composition of this compound?
Calculating the Percent Composition of a Compound
• 8.20g + 5.40g 13.60g
Mg O MgO
What is the percent composition of this compound?
Calculating the Percent Composition of a Compound
• 8.20g + 5.40g 13.60g
Mg O MgO
What is the percent composition of this compound?
For magnesium,
Mass of Mg
Total mass of compound
Calculating the Percent Composition of a Compound
• 8.20g + 5.40g 13.60g
Mg O MgO
What is the percent composition of this compound?
For magnesium,
Mass of Mg 8.2g =
Total mass of compound 13.6
Calculating the Percent Composition of a Compound
• 8.20g + 5.40g 13.60g
Mg O MgO
What is the percent composition of this compound?
For magnesium,
Mass of Mg 8.2g =
60.3%Total mass of compound 13.6
Calculating the Percent Composition of a Compound
• 8.20g + 5.40g 13.60g
Mg O MgO
What is the percent composition of this compound?
For magnesium,
Mass of Mg 8.2g = 60.3%Total mass of compound 13.6
So, for the Oxygen, 100% - 60.3% = 39.7%
Calculating the Percent Composition of a Compound
Sample Calculations
1. 9.30 grams of magnesium combine completely with 3.48 grams of nitrogen gas to form a compound. What is the percent composition of this compound?
Calculating the Percent Composition of a Compound
Sample Calculations
9.30g + 3.48g 12.78g
Mg + N2 (g) compound