A 25 G Sample Of A Compound Contains 13 G Of Sulfur. What Is The Percentage By Mass Of Sulfur? If The Compound Is Iron Sulfate, What Is The Mass Of Iron In The 25 G Sample?
Introduction
In chemistry, calculating the percentage by mass of an element in a compound is a crucial skill. This calculation helps us understand the composition of a compound and can be used to identify the elements present in a sample. In this article, we will calculate the percentage by mass of sulfur in a compound and determine the mass of iron in a 25 g sample of iron sulfate.
Calculating Percentage by Mass of Sulfur
To calculate the percentage by mass of sulfur in the compound, we need to know the mass of sulfur and the total mass of the compound. In this case, we are given a 25 g sample of the compound that contains 13 g of sulfur.
Formula for Calculating Percentage by Mass
The formula for calculating the percentage by mass of an element is:
% by mass = (mass of element / total mass of compound) x 100
Applying the Formula
Substituting the given values into the formula, we get:
% by mass of sulfur = (13 g / 25 g) x 100
Calculating the Percentage
To calculate the percentage, we can divide 13 by 25 and multiply by 100:
(13 / 25) x 100 = 52%
Therefore, the percentage by mass of sulfur in the compound is 52%.
Determining the Mass of Iron in Iron Sulfate
Now that we know the percentage by mass of sulfur in the compound, we can use this information to determine the mass of iron in a 25 g sample of iron sulfate.
Formula for Calculating Mass of Element
The formula for calculating the mass of an element is:
mass of element = (percentage by mass / 100) x total mass of compound
Applying the Formula
Substituting the given values into the formula, we get:
mass of iron = (52 / 100) x 25 g
Calculating the Mass of Iron
To calculate the mass of iron, we can multiply 52 by 25 and divide by 100:
(52 / 100) x 25 g = 13 g
Therefore, the mass of iron in a 25 g sample of iron sulfate is 13 g.
Conclusion
In this article, we calculated the percentage by mass of sulfur in a compound and determined the mass of iron in a 25 g sample of iron sulfate. By using the formula for calculating percentage by mass and mass of an element, we were able to determine the composition of the compound and identify the elements present in the sample.
Key Takeaways
- Calculating percentage by mass of an element is a crucial skill in chemistry.
- The formula for calculating percentage by mass is: % by mass = (mass of element / total mass of compound) x 100.
- The formula for calculating mass of an element is: mass of element = (percentage by mass / 100) x total mass of compound.
- By using these formulas, we can determine the composition of a compound and identify the elements present in a sample.
References
- Chemistry textbook, chapter 3: Stoichiometry
- Online resources: Khan Academy, Chemistry LibreTexts
Further Reading
- Stoichiometry: A Guide to Calculating Chemical Reactions
- Chemistry: The Central Science, 14th edition
- Chemistry LibreTexts: Stoichiometry
Glossary
- Percentage by mass: The percentage of an element in a compound by mass.
- Mass of an element: The mass of an element in a compound.
- Stoichiometry: The study of the quantitative relationships between reactants and products in chemical reactions.
A 25 g sample of a compound contains 13 g of sulfur. What is the percentage by mass of sulfur? If the compound is iron sulfate, what is the mass of iron in the 25 g sample? Q&A ===========================================================
Introduction
In our previous article, we calculated the percentage by mass of sulfur in a compound and determined the mass of iron in a 25 g sample of iron sulfate. In this article, we will answer some frequently asked questions related to the calculation of percentage by mass and mass of an element.
Q&A
Q: What is the formula for calculating percentage by mass of an element?
A: The formula for calculating percentage by mass of an element is:
% by mass = (mass of element / total mass of compound) x 100
Q: How do I calculate the percentage by mass of an element if I don't know the total mass of the compound?
A: If you don't know the total mass of the compound, you can use the formula:
% by mass = (mass of element / mass of sample) x 100
Q: What is the difference between percentage by mass and percentage by weight?
A: Percentage by mass and percentage by weight are the same thing. They both refer to the percentage of an element in a compound by mass.
Q: How do I calculate the mass of an element if I know the percentage by mass and the total mass of the compound?
A: To calculate the mass of an element, you can use the formula:
mass of element = (percentage by mass / 100) x total mass of compound
Q: What is the formula for calculating the mass of an element if I know the percentage by mass and the mass of the sample?
A: To calculate the mass of an element, you can use the formula:
mass of element = (percentage by mass / 100) x mass of sample
Q: Can I use the formula for calculating percentage by mass to calculate the mass of an element?
A: No, you cannot use the formula for calculating percentage by mass to calculate the mass of an element. The formula for calculating percentage by mass is used to calculate the percentage of an element in a compound, while the formula for calculating mass of an element is used to calculate the mass of an element in a compound.
Q: What is the difference between stoichiometry and percentage by mass?
A: Stoichiometry is the study of the quantitative relationships between reactants and products in chemical reactions, while percentage by mass is a calculation used to determine the percentage of an element in a compound by mass.
Q: Can I use the formula for calculating percentage by mass to calculate the percentage of an element in a mixture?
A: No, you cannot use the formula for calculating percentage by mass to calculate the percentage of an element in a mixture. The formula for calculating percentage by mass is used to calculate the percentage of an element in a compound, while the formula for calculating the percentage of an element in a mixture is different.
Q: What is the formula for calculating the percentage of an element in a mixture?
A: The formula for calculating the percentage of an element in a mixture is:
% by mass = (mass of element / total mass of mixture) x 100
Q: Can I use the formula for calculating percentage by mass to calculate the mass of an element in a mixture?
A: No, you cannot use the formula for calculating percentage by mass to calculate the mass of an element in a mixture. The formula for calculating percentage by mass is used to calculate the percentage of an element in a compound, while the formula for calculating the mass of an element in a mixture is different.
Q: What is the formula for calculating the mass of an element in a mixture?
A: The formula for calculating the mass of an element in a mixture is:
mass of element = (percentage by mass / 100) x total mass of mixture
Conclusion
In this article, we answered some frequently asked questions related to the calculation of percentage by mass and mass of an element. We hope that this article has helped you to understand the concepts of percentage by mass and mass of an element, and how to use the formulas to calculate them.
Key Takeaways
- The formula for calculating percentage by mass is: % by mass = (mass of element / total mass of compound) x 100.
- The formula for calculating mass of an element is: mass of element = (percentage by mass / 100) x total mass of compound.
- The formula for calculating the percentage of an element in a mixture is: % by mass = (mass of element / total mass of mixture) x 100.
- The formula for calculating the mass of an element in a mixture is: mass of element = (percentage by mass / 100) x total mass of mixture.
References
- Chemistry textbook, chapter 3: Stoichiometry
- Online resources: Khan Academy, Chemistry LibreTexts
Further Reading
- Stoichiometry: A Guide to Calculating Chemical Reactions
- Chemistry: The Central Science, 14th edition
- Chemistry LibreTexts: Stoichiometry
Glossary
- Percentage by mass: The percentage of an element in a compound by mass.
- Mass of an element: The mass of an element in a compound.
- Stoichiometry: The study of the quantitative relationships between reactants and products in chemical reactions.
- Mixture: A physical blend of two or more substances.
- Compound: A substance formed by the chemical combination of two or more elements.