Percent Composition



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 a piece of sugared gum and 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

| |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 | | | | |

|Sugared gum | | | | |

| | | | | |

|2 | | | | |

|Sugarless gum | | | | |

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. (mass of unchewed gum – mass of chewed gum)

Sample 1 (sugared):

Sample 2 (sugarless):

2) Percent composition: Mass of sugar/sweetener in gum (answer from #1) x 100 = ____%

Mass of unchewed gum

Sample 1(sugared):

Sample 2 (sugarless):

Data Analysis

1. How did the percent compositions of your two (sugared and non-sugared) gum samples compare to each other?

2. Sugar’s chemical formula is C12H22O11. What is the mass of one mole of sugar? In other words, find the molar mass of sugar.

3. How many moles of sugar were present in your group’s sugared gum?

Mass of sugar in sugared gum (#1) 1 mole = answer

Molar mass of sugar (#3)

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