Chemistry Workbook For Dummies by Chris Hren & Christopher Hren

Author:Chris Hren & Christopher Hren
Language: eng
Format: epub
ISBN: 9781119357469
Publisher: Wiley
Published: 2014-03-24T00:00:00+00:00

Aluminum is the excess reagent, and 1.5 g of it will remain after the reaction is completed. To calculate how much excess reagent (aluminum, in this case) will remain after a complete reaction, first calculate how much will be consumed:

Subtract that quantity from the amount of aluminum originally present to calculate the remaining amount: .

137 g of aluminum chloride. This calculation starts with the assumption that all the limiting reagent, chlorine gas, is consumed.

The reaction equation is already balanced, so you can proceed with the calculations. 88.46% is the percent yield. You’re given an actual yield (21.61 g of sulfurous acid) and asked to calculate the percent yield. To do so, you must calculate the theoretical yield. The question clearly shows that sulfur dioxide is the limiting reagent, so begin the calculation of theoretical yield by assuming that all the sulfur dioxide is consumed:

So the theoretical yield of sulfurous acid is 24.44 g. With this information, you can calculate the percent yield:

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