The Mixture and Its Components

Oct 13, 2025 by wbrum.org 27 views

Understanding Percent Composition

Percent composition is a measure of the percentage of each element present in a compound or mixture. It is calculated by dividing the mass of the element by the total mass of the compound or mixture, and then multiplying by 100. In this article, we will learn how to calculate the percent composition of glucose in a mixture.

The Mixture and Its Components

The mixture in question consists of glucose and water. Glucose is a simple sugar with the molecular formula C6H12O6. The total mass of the mixture is given as 276 grams. We are also given that the mixture contains 1.3 moles of glucose.

Calculating the Mass of Glucose

To calculate the percent composition of glucose in the mixture, we first need to calculate the mass of glucose present in the mixture. We can do this by multiplying the number of moles of glucose by its molar mass.

The molar mass of glucose (C6H12O6) can be calculated by adding the atomic masses of its constituent atoms:

Carbon (C) has an atomic mass of 12.01 g/mol
Hydrogen (H) has an atomic mass of 1.008 g/mol
Oxygen (O) has an atomic mass of 16.00 g/mol

The molar mass of glucose is therefore:

(6 x 12.01) + (12 x 1.008) + (6 x 16.00) = 180.16 g/mol

Now, we can calculate the mass of glucose present in the mixture by multiplying the number of moles of glucose by its molar mass:

Mass of glucose = Number of moles x Molar mass = 1.3 mol x 180.16 g/mol = 233.00 g

Calculating the Percent Composition of Glucose

Now that we have calculated the mass of glucose present in the mixture, we can calculate its percent composition. We can do this by dividing the mass of glucose by the total mass of the mixture, and then multiplying by 100:

Percent composition of glucose = (Mass of glucose / Total mass of mixture) x 100 = (233.00 g / 276 g) x 100 = 84.13%

Therefore, the percent composition of glucose in the mixture is 84.13%.

Conclusion

In this article, we learned how to calculate the percent composition of glucose in a mixture. We started by calculating the mass of glucose present in the mixture by multiplying the number of moles of glucose by its molar mass. We then calculated the percent composition of glucose by dividing the mass of glucose by the total mass of the mixture, and then multiplying by 100. The result was a percent composition of glucose of 84.13%.

Calculating the Mass of Water

Now that we have calculated the percent composition of glucose in the mixture, we can calculate the mass of water present in the mixture. We can do this by subtracting the mass of glucose from the total mass of the mixture:

Mass of water = Total mass of mixture - Mass of glucose = 276 g - 233.00 g = 43.00 g

Therefore, the mass of water present in the mixture is 43.00 g.

Calculating the Percent Composition of Water

Now that we have calculated the mass of water present in the mixture, we can calculate its percent composition. We can do this by dividing the mass of water by the total mass of the mixture, and then multiplying by 100:

Percent composition of water = (Mass of water / Total mass of mixture) x 100 = (43.00 g / 276 g) x 100 = 15.57%

Therefore, the percent composition of water in the mixture is 15.57%.

Conclusion

In this article, we learned how to calculate the percent composition of glucose and water in a mixture. We started by calculating the mass of glucose present in the mixture by multiplying the number of moles of glucose by its molar mass. We then calculated the percent composition of glucose by dividing the mass of glucose by the total mass of the mixture, and then multiplying by 100. We also calculated the mass of water present in the mixture by subtracting the mass of glucose from the total mass of the mixture, and then calculated its percent composition by dividing the mass of water by the total mass of the mixture, and then multiplying by 100. The results were a percent composition of glucose of 84.13% and a percent composition of water of 15.57%.

Calculating the Molar Mass of Water

The molar mass of water (H2O) can be calculated by adding the atomic masses of its constituent atoms:

Hydrogen (H) has an atomic mass of 1.008 g/mol
Oxygen (O) has an atomic mass of 16.00 g/mol

The molar mass of water is therefore:

(2 x 1.008) + (1 x 16.00) = 18.02 g/mol

Calculating the Number of Moles of Water

Now that we have calculated the molar mass of water, we can calculate the number of moles of water present in the mixture. We can do this by dividing the mass of water by its molar mass:

Number of moles of water = Mass of water / Molar mass of water = 43.00 g / 18.02 g/mol = 2.39 mol

Therefore, the number of moles of water present in the mixture is 2.39 mol.

Calculating the Percent Composition of Water (Alternative Method)

Now that we have calculated the number of moles of water present in the mixture, we can calculate its percent composition using an alternative method. We can do this by dividing the number of moles of water by the total number of moles of the mixture, and then multiplying by 100:

Percent composition of water = (Number of moles of water / Total number of moles) x 100 = (2.39 mol / 3.69 mol) x 100 = 64.51%

Therefore, the percent composition of water in the mixture is 64.51%.

Conclusion

Frequently Asked Questions

Q: What is percent composition?

A: Percent composition is a measure of the percentage of each element present in a compound or mixture. It is calculated by dividing the mass of the element by the total mass of the compound or mixture, and then multiplying by 100.

Q: How do I calculate the percent composition of glucose in a mixture?

A: To calculate the percent composition of glucose in a mixture, you need to know the mass of glucose present in the mixture and the total mass of the mixture. You can calculate the mass of glucose by multiplying the number of moles of glucose by its molar mass. Then, you can calculate the percent composition of glucose by dividing the mass of glucose by the total mass of the mixture, and then multiplying by 100.

Q: How do I calculate the mass of glucose present in a mixture?

A: To calculate the mass of glucose present in a mixture, you need to know the number of moles of glucose and its molar mass. You can calculate the mass of glucose by multiplying the number of moles of glucose by its molar mass.

Q: What is the molar mass of glucose?

A: The molar mass of glucose (C6H12O6) is 180.16 g/mol.

Q: How do I calculate the percent composition of water in a mixture?

A: To calculate the percent composition of water in a mixture, you need to know the mass of water present in the mixture and the total mass of the mixture. You can calculate the mass of water by subtracting the mass of glucose from the total mass of the mixture. Then, you can calculate the percent composition of water by dividing the mass of water by the total mass of the mixture, and then multiplying by 100.

Q: How do I calculate the number of moles of water present in a mixture?

A: To calculate the number of moles of water present in a mixture, you need to know the mass of water and its molar mass. You can calculate the number of moles of water by dividing the mass of water by its molar mass.

Q: What is the molar mass of water?

A: The molar mass of water (H2O) is 18.02 g/mol.

Q: Can I use an alternative method to calculate the percent composition of water?

A: Yes, you can use an alternative method to calculate the percent composition of water. You can calculate the number of moles of water by dividing the mass of water by its molar mass, and then calculate the percent composition of water by dividing the number of moles of water by the total number of moles of the mixture, and then multiplying by 100.

Q: What is the percent composition of glucose and water in a mixture?

A: The percent composition of glucose and water in a mixture depends on the specific mixture and its composition. However, in the example given in this article, the percent composition of glucose is 84.13% and the percent composition of water is 15.57%.

Q: How do I apply the concepts learned in this article to real-world problems?

A: The concepts learned in this article can be applied to real-world problems in various fields, such as chemistry, biology, and environmental science. For example, you can use the concepts learned in this article to calculate the percent composition of different compounds in a mixture, or to determine the concentration of a solution.

Conclusion

In this article, we have answered some frequently asked questions about calculating percent composition of glucose and water in a mixture. We have provided step-by-step instructions on how to calculate the percent composition of glucose and water, and have also discussed alternative methods for calculating the percent composition of water. We hope that this article has been helpful in clarifying any doubts you may have had about calculating percent composition.