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Cereal Wars

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CP CHEMISTRY Name: __________________________________
Percent Composition – Bubble Gum Lab ____ period

Much like cooking, chemistry relies on accurate measurement to ensure the intended results. Measuring in chemistry is done using the mole. This lab is intended to determine the percent composition of sugar in bubble gum based on molar mass. Chew carefully and don’t swallow the compound.

Lab Goals

• Determine percent composition of a compound based on mass. • Calculate the moles of sugar in bubble gum.

Procedure 1. Obtain either a piece of sugared gum or sugarless gum. 2. Determine the mass of the unchewed piece of gum with its paper wrapper. 3. Place gum in mouth and chew for five minutes. 4. Remove gum from mouth and dry. 5. Put the gum back into its paper wrapper and determine its mass. 6. Calculate the percent composition of the sugar/sweetener in the gum.

Data

| |Sugar or Sugarless? |Mass of Unchewed gum (g)|Mass of Chewed Gum |Mass of Sugar in gum |Percent Composition of Sugar|
|Gum Sample | | |(g) |(g) |in Gum |
| | | | | | |
|1 | | | | | |
| | | | | | |
|2 | | | | | |
| | | | | | |
|3 | | | | | |
| | | | | | |
|4 | | | | | |

CP CHEMISTRY, Percent Composition – Bubble Gum Lab, page 2

Calculations
You must show the calculations for your sample. You may right down the data from the rest of your group’s samples.

1) Calculation of the amount of sugar in gum.

2) Percent composition calculation.

Data Analysis

1. How did the percent compositions of your two sugared gum samples compare to each other? How did the percent compositions of your two sugar-free gum samples compare?

2. How did the percent composition of sweetener in sugared gum compare to the sugar-free gum?

3. Sugar’s chemical formula is C12H22O11. What is the mass of one mole of sugar?

4. How many moles of sugar were present in one of the pieces of your group’s sugared gum?

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