DATA TABLE: Mass of unpopped popcorn
Mass of popped popcorn
Mass of water
Percent of water in popcorn
2.00 grams
1.70 grams
8. Using the mass of the popcorn BEFORE popping and find the number of:
a. Moles in the popcorn. Note: 1 mole popcorn = 79g.(Show Bracket)
b. Molecules in the popcorn.(Show Bracket)
9. Using the mass of the popcorn AFTER popping and find the number of:
a. Moles in the popcorn. (Show Bracket)
b. Molecules in the popcorn. (Show Bracket)

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)