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Discovering Mass Percent in Compounds Using M&M's: A Fun Chemistry Activity!

Welcome to an engaging chemistry activity where you and your partner will explore the concept of mass percent using M&M's! You will measure the mass percent of each color candy in your cup, employing techniques that apply to various compounds. We will discuss how to find the percent composition of compounds like ethanol (C2H5OH) by calculating the molecular weight and individual element contributions. This interactive experiment not only reinforces theoretical concepts but also adds a tasty twist to learning chemistry. Ensure all percentages add up to 100%!

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Discovering Mass Percent in Compounds Using M&M's: A Fun Chemistry Activity!

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Presentation Transcript

  1. Welcome to Chemistry!!

  2. M & M Question • You and your partner will be given a cup of M&M’s. It is your job to find the mass percent of each color in your cup. Do not put the M&M’s on the lab table if you intend to eat them!

  3. M & M Question • We can use this same technique to find the mass percent in different compounds.

  4. Percent Composition • We can use the information from the formula of compound to find the percent composition • We use the mass of each element in 1 mole of the compound

  5. Percent Composition • For example, we are going to use the compound ethanol with the formula C2H5OH • First find the molecular weight of ethanol

  6. Percent Composition • Mass of C = 12.01 x 2 = 24.02 • Mass of H = 1.008 x 6 = 6.048 • Mass of O = 16.00 x 1 = 16.00 • Sum = 46.07g = molecular mass

  7. Percent Composition • Solve for mass percent of each element • MP of C = 24.02/46.07 x 100% • MP of C = 52.14%

  8. Percent Composition • MP of H = 6.048/46.07 x 100% • MP of H = 13.13% • MP of O = 16.00/46.07 x 100% • MP of O = 34.73%

  9. Percent Composition • The easiest way to check is to make sure that all your percents total 100%!!!

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