2.  To find the mass percent of sugar in a piece of bubble gum

3. 1. Unwrap a piece of gum and place the wrapper on the balance. Zero the balance. Then place the gum on the wrapper (do not let it touch the balance!) 2. Record the mass of the gum in grams. 3. Chew the gum until the sugar is removed (no flavor) ◦ Work on handout (Formula Weights and Percents) in the meantime. 4. Mass the gum again and dispose

4. 1. Mass of new gum_________ 2. Mass of chewed gum __________

5.  Calculate mass of sugar: ◦ Mass of new gum – mass of chewed gum = mass of sugar  Calculate percent of sugar ◦ mass of sugar X 100 = % mass of new gum  Calculate Percent Error ◦ Actual value: 3 g sugar ◦ Actual percent sugar: mass of sugar X 100 = % mass of new gum ◦ Percent error = % in your gum – actual % X 100= % actual %

6.  The mass percent of sugar in my gum was ___________. The actual percent of sugar was __________. My percent error was ____________. To be more accurate I could (list 2 things)