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Molar conversions chemistry lab
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A "dry lab" that demonstrates basic techniques used to perform weight measurements, mass-mole-particle conversions, and percent composition
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Molar Conversions LabCollect the data on this sheet by looking at the attached pictures of each station. Complete all calculations,
show your work and circle your answers.
Station A: This gray substance is aluminum. What is it’s mass?
Mass of Sample = _______26.95 grams___ (1 point)
1. How many moles of aluminum is this sample? Show calculations.
(2 points)
n (Al) = 26.95 g / 26.98 g/mol = 0.999 mol
26.95 g
2. Approximately how many atoms of aluminum are in this sample?
Show calculations (3 points)
6.02×1023 × 0.999 = 6.014×1023 atoms
Station B: This station has paper drinking cups. Fill one cup halfway full of water.
3. Mass of Cup with Water = _________72.31 g______ (1 point)
4. Drink the water and measure the mass of the empty cup.
Mass of Empty Cup = ______2.55g___________
5. How many molecules of water did you drink?
Show calculations (4 points)
72.31 g
, Mass of water without cup: 72.31g – 2.55g = 69.76g
n (H2O) = 69.76g / 18.02 g/mol = 3.87 mol
6.02×1023 × 3.87 = 2.33×1024 molecules
Station C:
The blue crystal on the balance is copper (II) sulfate pentahydrate. Its
formula is CuSO4 ● 5H2O.
Measure the mass of the sample of copper (II) sulfate pentahydrate.
6. Mass of Sample = __56.68g__________ (1 point)
7. What is the molar mass of copper (II) sulfate pentahydrate? Show
calculations. (4 points) 56.68 g
M (CuSO4● 5H2O) = Ar (Cu) + Ar (S) + 9×Ar (O) + 10×Ar (H) = 63.55 +
32.06 + 9×16 + 10×1.01 = 249.71 g/mol
8. How many moles of copper (II) sulfate pentahydrate are in this crystal? Show calculations. (4 points)
n (CuSO4● 5H2O) = 56.68g / 249.71 g/mol = 0.227 mol
Station D: .
9. Find a packaged/bottled item in your kitchen that contains sugar (sucrose). Give the name and brand of
your item, or paste a picture here: (4 points)
A can of Coke
10. Paste picture of the nutrition label of your item here (1 point):
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