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Chapter 19

Chapter 19. Gas Stoichiometry. If an excess of chlorine gas reacts with a solution containing 20.0g of potassium bromide how many cm 3 of bromine gas can be produced at STP?. 2KBr + Cl 2 → Br 2 + 2KCl. 1 mol Br 2. 20.0g KBr. mol KBr. 22.4 dm 3. 1000 cm 3. = 1880 cm 3. 119g KBr.

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Chapter 19

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  1. Chapter 19 Gas Stoichiometry

  2. If an excess of chlorine gas reacts with a solution containing 20.0g of potassium bromide how many cm3 of bromine gas can be produced at STP? 2KBr + Cl2 → Br2 + 2KCl 1 mol Br2 20.0g KBr mol KBr 22.4 dm3 1000 cm3 = 1880 cm3 119g KBr 2 mol KBr 1 mol Br2 1 dm3

  3. In the reaction between aluminum and oxygen, how many grams of aluminum are needed to react with 5.00 dm3 of oxygen at STP? 4Al + 3O2 → 2Al2O3 5.00 dm3 O2 mol O2 4 mol Al 27.0 g = 8.04 g 22.4 dm3 3 mol O2 mol Al

  4. How many cm3 of chlorine gas are required to react with hydrogen gas to produce 50.0 cm3 of hydrogen chloride gas at STP? H2 + Cl2 → 2HCl • This is a volume – volume calculation. • We can use a shortcut for these type of calculations. 1 cm3 Cl2 50.0cm3 HCl = 25.0 cm3 2 cm3 HCl

  5. Homework • Worksheet: Gas Stoichiometry • Lab Summary: “Molecular Mass of a Gas”

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