Survival Guide to the Chemistry Cookie Project

Did you chemistry teacher assign the infamous chemistry cookie project? Are you required to convert cups to moles? Is your mind dumbfounded as to how it is possible to calculate the amount of molecules in a cookie? If so, then this is the guide for you.Cookie Conversions

  1. Find conversion factors for ingredients in cups to grams.
  2. Convert ingredients into grams.
  3. Find molecular formula of ingredient.
    1. If ingredient has different chemicals (i.e. all purpose flour), multiply converted mass by percentage. Label each calculated value accordingly.
  4. Calculate molar mass of each chemical. (Use Web Elements for periodic table)
  5. Divide calculated values by their molar mass. Number of moles is obtained.
  6. Multiply number of moles by Avogadro’s number (6.02*10^23 or 6.02e23). Number of molecules/formula units is obtained.

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Some conversion factors

  • All purpose flour (87% C4H8O4, 7% C6H12O3N2, 6%, H2O)
    • 1 cup = 128g
  • Confectioner’s sugar (Use white sugar)
    • 1 cup = 128g
    • 1 teaspoon = 10g
  • Bread flour (Use all purpose flour)
    • 1 cup = 136g
  • Baking soda (NaHCO3)
    • 1 teaspoon = 4g
  • Baking powder (80% NaHCO3, 20% KHC4H4O6)
    • 1 teaspoon = 4g
  • Table salt (NaCl)
    • 1 teaspoon = 8g
  • Corn starch (Unknown, check with your chem teacher)
    • 1 cup = 125g
    • 1 tablespoon = 8g
  • Butter (C9H14O6)
    • 1 cup = 230g
    • 1 cup = 2 sticks
  • Granulated sugar (Use white sugar)
    • 1 cup = 200g
    • 1 teaspoon = 15g
  • Vanilla extract (C8H8O3)
    • 1 teaspoon = 4.2g
  • Brown sugar (C12H22O11)
    • 1 cup = 220g

Sources for more conversion factors (Note: Some values of the same substance may differ)

Gourmet Sleuth, All Recipes, Cafe Fernando

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