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Do Now. In order to make 1 salad it requires 1 head of lettuce, two tomatoes and three carrots. What would be the coefficients for the lettuce, tomatoes, and carrots assuming you wanted to make 3 salads ? Write the coefficients below!

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Do Now

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  1. Do Now In order to make 1 salad it requires 1 head of lettuce, two tomatoes and three carrots. What would be the coefficients for the lettuce, tomatoes, and carrots assuming you wanted to make 3 salads? Write the coefficients below! In order to make 1 bike it requires 1 horn, 2 tires, and 1 chain. What would be the coefficients for the horn, tire, and chain, assuming you wanted to make 4 bikes? Write the coefficients below! In order to make 1 batch of cookies it requires 2 cups flour, 3 eggs, and 1 cup sugar. What would be the coefficients for the flour, eggs, and sugar, assuming you wanted to make 10 batches of cookies? Write the coefficients below! 3 4 10

  2. Day 1 - Notes Unit: Stoichiometry Using Mole Ratios and Review of Balancing Chemical Equations

  3. After today you will be able to… • Calculate the number of moles of a substance that can be produced from their coefficients in the balanced chemical equation • Review of the basics of how to balance a chemical equation

  4. The wordstoichiometrycomes from the Greek words: stoicheion(meaning "element") metron(meaning "measure") Stoichiometry: The study of quantities as it relates to chemical reactions. Based on the roots, what does it mean?

  5. Balanced chemical equations can be interpreted many ways… 1. Molecules • 1N2(g) + 3H2(g) 2NH3(g) H • molecules: N N H H H H H H H H H H N N +  H

  6. Balanced chemical equations can be interpreted many ways… 2. Mass • 1N2(g) + 3H2(g) 2NH3(g) • (6 x 1.01) • (2 x 14.01) • (6 x 1.01) + (2 x 14.01) +  • 34.08g • 28.02g • 6.06g • 34.08g • = • 34.08g • Mass of reactants and products are always equal!

  7. Balanced chemical equations can be interpreted many ways… 3. Mole Ratio • 1N2(g) + 3H2(g) 2NH3(g) • moles: +  • 2 mol NH3 • 1 mol N2 • 3 mol H2 • This is the relationship we will focus on in this unit!

  8. Mole-Mole Calculations • The coefficients in the balanced equation represent the smallest whole number mole ratio between reactants and products.

  9. Mole-Mole Calculations • Examples of mole ratios for the reaction: • 1N2(g) + 3H2(g) 2NH3(g) 1 mol N2 2 mol NH3 3 mol H2 1 mol N2 2 mol NH3 3 mol H2

  10. Mole-Mole Calculations • Example: If 3.86 moles of potassium reacts completely with excess water, how many moles of hydrogen would be produced? hydrogen hydroxide water potassium +  potassium hydroxide + hydrogen __K 2 __ H(OH) 2 __ K(OH) + __ H2 1 2  + K: 3.86 mol K U: ? mol H2 3.86 mol K 1 1 mol H2 2 mol K 1.93 mol H2 x =

  11. Mole-Mole Calculations • Example: How many moles of aluminum will react with 0.512 moles of hydrochloric acid? hydrogen chloride aluminum + hydrogen chloride aluminum + hydrochloric acid  __Al 2 __HCl 6 __ AlCl3 + __ H2 3 2  + K: 0.512 mol HCl U: ? mol Al 2 mol Al 6 mol HCl 0.512 mol HCl 1 0.171 mol Al x =

  12. Questions? Begin HW1

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