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Combustion experiments are still done today

Mr. Quinn & Ms. Tom January 10, 2014 Aim: How can empirical formulas be found from mass percent data ? Do Now: What is 35% of 100? What is 35% of 72? Simplify this expression:. Combustion experiments are still done today.

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Combustion experiments are still done today

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  1. Mr. Quinn & Ms. Tom January 10, 2014Aim: How can empirical formulas be found from mass percent data?Do Now:What is 35% of 100?What is 35% of 72?Simplify this expression:

  2. Combustion experiments are still done today • Chemicals are burned in a bomb calorimeter this provides data on the percent by mass of each element • We are calculating the empirical formula: • Definition: the smallest whole-number ratio between the elements in a molecule or salt

  3. The Steps • Determine masses of each reactant. • Divide masses by atomic mass. • Divide coefficients by smallest to find ratio

  4. Calculating the formula of LixBry • 5 g of Li becomes 62.5 g of LixBry

  5. Calculating the formula of formaldehyde • C: 40% • H: 7 % • O:53 %

  6. Calculating the formula of aminoethanol • C: 39% • H: 11.5% • N: 23% • O: 26%

  7. Your Turn!

  8. Exit Ticket • Your calculations lead you to determine that the mole ratio of Cs to O in cesium oxide is 2:1. What is the formula for cesium oxide? • CsO • CsO2 • Cs2O • Cs2O2

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