Post-Lab Questions 1. Discuss how each of the following actions would affect the calculated % oxygen in the magnesium oxide compound. Would the percentage be too high, too low, or remain the same? a. The evaporation of water caused "spattering." Compsition b. Water was not completely removed by evaporation.

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Post-Lab Questions
1. Discuss how each of the following actions would affect the calculated % oxygen in the magnesium
oxide compound. Would the percentage be too high, too low, or remain the same?
a. The evaporation of water caused "spattering."
tion
b. Water was not completely removed by evaporation.
2. The white powder often found on objects made of aluminum is aluminum oxide, Al,O,
A 5.00 g strip of aluminum is reacted in air, producing an oxide weighing 9.36 g.
Calculate the percent oxygen and aluminum in the compound.
3. Aluminum oxide has the empirical formula of Al,O3.
a. Calculate the % aluminum in Al,O3, using the chemical formula.
b. Calculate the % error for the percent aluminum calculated in question 2.
85
COPYRIGHT 2013 Cengage Learning
Transcribed Image Text:Post-Lab Questions 1. Discuss how each of the following actions would affect the calculated % oxygen in the magnesium oxide compound. Would the percentage be too high, too low, or remain the same? a. The evaporation of water caused "spattering." tion b. Water was not completely removed by evaporation. 2. The white powder often found on objects made of aluminum is aluminum oxide, Al,O, A 5.00 g strip of aluminum is reacted in air, producing an oxide weighing 9.36 g. Calculate the percent oxygen and aluminum in the compound. 3. Aluminum oxide has the empirical formula of Al,O3. a. Calculate the % aluminum in Al,O3, using the chemical formula. b. Calculate the % error for the percent aluminum calculated in question 2. 85 COPYRIGHT 2013 Cengage Learning
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