Post-Lab Questions

1. What are the masses of each component?

2. What is the percent mass of each component in the mixture?

3. Collect data about the percent masses from four other groups in the

laboratory. Use that data to calculate the average percent mass of each

component and the relative average deviation of the mass percent of each

component.

4. Your instructor will provide you with the true mass percents of each

component. Calculate the percent error of your group average mass percents.

5. Which mass percent was the most and which was the least precise? Which

mass percent was the most and which was the least accurate?

6. Explain experimentally why you think the mass percents of certain

components were more or less precise or accurate.

References

Dr. Aimee Miller, CHEM 103 Laboratory Manual, Millersville University.

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