Combined Concepts.pdf - Thinkwell Chemistry Course Notes A...

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A Problem Using the Combined Concepts of Stoichiometry Several tools can be brought together to solve a stoichiometry problem. Problem : 7.75 g of aluminum, 8.00 g of sodium hydroxide, and 100 g of water were reacted. 0.541 g of hydrogen gas was collected. What was the percent yield ? First, the chemical equation must be balanced. In the balanced chemical equation, 2 mol Al react with 2 mol NaOH and 6 mol H 2 O to produce 2 mol NaAl(OH) 4 and 3 mol H 2 . Second, the masses of reagents given must be converted to moles. The mass of each reactant is divided by its molar mass to give moles. For example, 7.75 g Al is equivalent to 0.287 mol Al. Next, the limiting reagent must be determined. To determine the limiting reagent, calculate how much hydrogen gas could be produced from each reactant.
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