What is the percent composition by mass of oxygen in H₂O?

What is the percent composition by mass of oxygen in H₂O?

What is the formula to calculate the percent composition by mass of oxygen in H₂O?

Final answer:

The percent composition by mass of oxygen in H₂O is 89%.

Explanation:

To find the percent composition by mass of oxygen in H₂O, we need to determine the molar mass of oxygen and water. The molar mass of oxygen (O) is 16 g/mol, and the molar mass of water (H₂O) is 18 g/mol. To calculate the percent composition, we divide the molar mass of oxygen by the molar mass of water and multiply by 100. Using this formula, the percent composition of oxygen in H₂O is:

(16 g/mol / 18 g/mol) * 100 = 88.9%

Therefore, the correct answer is a. 89%.

The percent composition by mass of oxygen in H₂O is an essential concept in chemistry. It helps us understand the relative amount of oxygen present in a water molecule. By calculating this percentage, we can gain insights into the chemical composition and properties of water.

In the given question, the formula to calculate the percent composition by mass of oxygen in H₂O involves determining the molar masses of oxygen and water, as well as applying a simple mathematical formula to derive the percentage. Understanding this formula is crucial for solving similar problems in chemistry and mastering the concept of percent composition.

By following the step-by-step explanation provided in the answer section, you can grasp the process of calculating the percent composition by mass of oxygen in H₂O. Make sure to practice similar problems and explore additional resources to deepen your understanding of this fundamental concept in chemistry.