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L17_Molar_Mass
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Molar Mass
PRE-LAB QUESTIONS
1. Imagine you are a guest speaker at a kindergarten class, and you are asked to explain
Avogadro’s number. What would you say and why?
2. Use the space below to draw a diagram explaining the relationship between atoms,
moles, and molecules.
3. Why is Avogadro’s number referred to as a mole? If you could change this terminology,
what would you change it to and why?
©eScience Labs, LLC 2015
Molar Mass
EXPERIMENT 1: PERCENT SUGAR IN BUBBLE GUM
Data Sheet
Table 2: Sugar (Sucrose) Data
Mass of
unchewed gum
(g)
Mass of
chewed gum
(g)
Mass of sugar
(g)
Percent of sugar
in gum
Post-Lab Questions
1. What is the percent sugar? Show your calculations.
2. What is the molar mass of sugar (sucrose, C12H22O11)? Show your calculations.
3. Convert the mass of dissolved sugar to moles. Show your calculations.
4. Convert the moles of sugar to molecules of sugar. Show your calculations.
5. Imagine that you used four pieces of gum instead of two. Calculate the number of moles.
Show your calculations.
6. How does the mass of the saliva alter the experimental data?
©eScience Labs, LLC 2015
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