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VI. Equation Problems

VI. Equation Problems. These problems use balanced equations to determine the amounts of products or reactants used. Always use the. MOLE RATIO. A. Mole - Mole Problems. Determine the number of moles of one compound using the moles of another. Set up a “road map” to solve your problem.

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VI. Equation Problems

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  1. VI. Equation Problems These problems use balanced equations to determine the amounts of products or reactants used Always use the MOLE RATIO A. Mole - Mole Problems Determine the number of moles of one compound using the moles of another Set up a “road map” to solve your problem Steps 1. Write out the balanced equation 2. Write out the mole ratio under each compound 3. Write in the known information 4. Circle the area where the answer should be placed 5. Use the mole ratios to determine the answer

  2. Example 1. The equation N2 + 3 H2 --> 2 NH3 is balanced. How many moles of H2 are needed to react with 1.5 moles of N2? Equation mole ratio moles N2 + 3 H2 --> 2 NH3 3 2 1 3 1.5 moles 4.5 moles 1 = 1.5 x X = 4.5 moles 2. Using the same equation, how many moles of N2 will react to give us 0.28 moles of NH3? 2 Equation mole ratio moles 1 N2 + 3 H2 --> 2 NH3 = x 0.28 3 2 1 X = 0.14 moles 0.28 moles 0.14 moles

  3. In the same equation, we have 28.02 GRAMS of N2, how many moles of NH3 can we make? Add a line above the equation for grams 28.02 g Grams Equation mole ratio moles N2 + 3 H2 --> 2 NH3 3 2 1 2.000 moles 1.000 mole We must convert the grams of N2 to moles of N2, then find the moles of NH3 Converting g--> moles 28.02 g x 28.02 g mole mole 28.02 g 1.000 mole

  4. In the equation 2 H2 + O2 --> 2 H2O, how many moles of water can be made from 64.00 g of oxygen gas? 64.00 g x 32.00 g mole mole 32.00 g 64.00 g Grams Equation mole ratio moles 2.000 mole 2 H2 + O2 --> 2 H2O 2 1 2 4.000 moles 2.000 mole B. Gram - Gram Problems We are given grams of one compound, and are looking for grams of another We can’t use mole ratios with grams because all molecules have different masses.

  5. Steps 1. Set up the problem (same as 1-4 before) 2. Turn known grams into moles 3. Use mole rations to determine the unknown moles 4. Turn moles into unknown grams Example 1. In the equation 2 Hg + O2 --> 2 HgO, how many grams of mercury are needed to react with 16.00 g of oxygen gas? 200.6 g 16.00 g Grams Equation mole ratio moles 2 Hg + O2 --> 2 HgO 2 1 2 1.000 moles 0.5000 mole 16.00 g x 32.00 g mole mole 32.00 g 200.59 g x 1.000 moles mole 200.6 g 0.5000 mole

  6. In the balanced equation H2 + Cl2 --> 2 HCl, how many grams of Cl2 are needed to create 18.23 g of HCl? 17.73 g Grams Equation mole ratio moles 18.23 g H2 + Cl2 --> 2 HCl 2 1 1 0.2500 mole 0.5000 mole 70.90 g x 0.2500 moles mole 18.23 g x 36.46 g mole mole 36.46 g 0.5000 mole 17.73 g

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