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Percent Composition

Percent Composition. Percent Composition from the Chemical Formula. % mass = mass of element in 1 mole of compound molar mass of compound Then multiply by 100 to get %.

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Percent Composition

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  1. Percent Composition

  2. Percent Composition from the Chemical Formula • % mass = mass of element in 1 mole of compound molar mass of compound • Then multiply by 100 to get %

  3. Propane (C3H8) is one of the compounds obtained from petroleum. Calculate the percent composition of propane. • Need to find mass of each element in 1 mole of the compound & mass of the 1 mole of the compound • Mass of C in one mole of C3H8= 36.033 g • Mass of H in one mole of C3H8= 8.064 g • Molar mass of C3H8= 44.097 g

  4. % of C = mass of C x 100 mass of propane (36.033 g/44.097 g) x 100 = 81.713% • % of H = mass of H x 100 mass of propane (8.064 g/44.097 g) x 100 = 18.29 %

  5. Results should add up to approximately 100%. • If not, you did something wrong!

  6. Using % composition • Can determine how much of a substance can be produced. • For example, how many grams of hydrogen are contained in a 100 g sample of propane?

  7. How many grams of hydrogen are contained in a 39.0 g sample of propane? • How many grams are carbon?

  8. Examples • Determine the percent composition of AlPO4.

  9. Lab Directions • Complete “Day 1” Instructions (except for acid part) • Place a piece of tape with your names on it on the beaker • Place the beaker with penny on the cart

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