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Stoichiometry Class Starter: Al and Cl2 Reaction

In this class starter activity, students will calculate the number of product atoms formed when 23.44 g of Al reacts with excess Cl2. The concept of stoichiometry and mole calculations will be reinforced through balanced equations and conversion calculations.

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Stoichiometry Class Starter: Al and Cl2 Reaction

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  1. Chem 11 – Class Starter Take out a piece of paper and answer the following question. If 23.44 g of Al reacts with an excess amount of Cl2 how many atoms of product are formed?

  2. Chem 11 – Class Starter Take out a piece of paper and answer the following question. If 23.44 g of Al reacts with an excess amount of Cl2 how many atoms of product are formed? 2Al + 3Cl2 2AlCl3

  3. STOICHIOMETRY: Last Class Gram A to Gram B

  4. But we can go anywhere… Gram A to Gram B

  5. But we can go anywhere… Gram A to Gram B

  6. Mole Man and Strategy The “Road Map” • You can’t always get from point A to point B directly! • Remember you during ALL stoich problems you will have to cross a mole bridge…

  7. Balance the following equation: SO2 + O2 SO3

  8. Balance the following equation: 2 SO2 + O2 2 SO3

  9. 2 SO2 + O2 2 SO3 At STP, What volume of oxygen is required to produce 742 L of SO3?

  10. N2 + H2  NH3

  11. N2 + 3 H2  2 NH3 What mass of nitrogen gas is required to produce 45L of ammonia at STP?

  12. N2 + 3 H2  2 NH3 How many litres of ammonia are produced when nitrogen reacts with 15L of hydrogen gas at STP?

  13. Molar Concentration STOICH

  14. STOICHIOMETRY: The MATH behind CHEMISTRY Gram A to Gram B

  15. Molarity Stoichiometric calculations involving Molarity follow the same procedure as described for Mass and Molar Volume

  16. Solve the following Question 2 K(s) + 2 H2O(l) ➝ 2 KOH(aq) + H2(g) • The exothermic reaction often releases enough heat to ignite the hydrogen gas it produces. • What mass of potassium metal would be required to produce 250 mL of a 0.45 mol/L solution of potassium hydroxide? K(s) + H2O(l) ➝ KOH(aq) + H2(g)

  17. Solve the following Question • What volume of 0.80 mol/L sodium iodide solution would completely react with 2.4 × 1024 molecules of chlorine gas? 2NaI(l) + Cl2(g) 2NaCl(s) + I2(g)

  18. Solve the following Question How many liters of carbon dioxide gas would be formed at STP if 1.5 L of 1.75 M phosphoric acid were reacted with excess potassium carbonate solution? Be cautious, as this question requires the use of both molar volume and molarity as conversion factors.Equation: 3K2CO3(s) + 2H3PO4(aq) 3CO2(g) + 2K3PO4(aq) + 3H2O(l)

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