To determine the percent by mass of oxygen in the sample, follow these steps:
1. Identify the total mass of the sample.
- The total mass of the sample is 150 grams.
2. Identify the mass of oxygen in the sample.
- The mass of oxygen in the sample is 60 grams.
3. Calculate the percent by mass of oxygen.
- The formula to calculate the percent by mass of an element in a sample is:
[tex]\[
\text{Percent by mass} = \left( \frac{\text{mass of element}}{\text{total mass of sample}} \right) \times 100
\][/tex]
- Plugging in the values:
[tex]\[
\text{Percent by mass of oxygen} = \left( \frac{60 \text{ grams}}{150 \text{ grams}} \right) \times 100
\][/tex]
[tex]\[
\text{Percent by mass of oxygen} = \left( \frac{60}{150} \right) \times 100
\][/tex]
[tex]\[
\text{Percent by mass of oxygen} = 0.4 \times 100
\][/tex]
[tex]\[
\text{Percent by mass of oxygen} = 40
\][/tex]
4. Select the correct option.
- The calculated percent by mass of oxygen is 40%.
So, the percent by mass of oxygen in the sample is 40%.
