54 Chemistry 106 Name: Post-Lab Assessment Questions (20 points): 1. (2 pts) How
ID: 542855 • Letter: 5
Question
54 Chemistry 106 Name: Post-Lab Assessment Questions (20 points): 1. (2 pts) How many grams of H20 are necessary to weigh out 1 mole of H20? 2. (2 pts) How many molecules of water are there one mole of H20? 3. (2 pts) How many moles of H20 are there in 1.0 g of H20? 4. (2 pts) How many molecules of H20 are there in 1.0 g of H20? 5. (4 pts) If a gumdrop is 1.5 cm3 in volume, what would the volume of a dozen gumdrops be? (4 pts) If a raindrop is 0.05 cm3 in volume, what would the volume of an Avogadro Number of raindrops be? 6. (4 pts) Lauric acid is used to make the detergents found in shampoo and toothpaste. Lauric acid is similar to stearic acid, but only has 12 carbons. Show the Lewis structure for lauric acid. 7.Explanation / Answer
1)
Molar mass of H2O,
MM = 2*MM(H) + 1*MM(O)
= 2*1.008 + 1*16.0
= 18.016 g/mol
mass of H2O,
m = number of mol * molar mass
= 1 mol * 18.016 g/mol
= 18.02 g
Answer: 18.0 g
2)
1 mol of H2O has 6.022*10^23 moelcules
3)
Molar mass of H2O,
MM = 2*MM(H) + 1*MM(O)
= 2*1.008 + 1*16.0
= 18.016 g/mol
mass(H2O)= 1 g
number of mol of H2O,
n = mass of H2O/molar mass of H2O
=(1.0 g)/(18.016 g/mol)
= 5.55*10^-2 mol
Answer: 5.55*10^-2 mol
4)
number of molecules = number of mol * Avogadro’s number
= 5.55*10^-2 mol * 6.022*10^23 molecules/mol
= 3.34*10^22 molecules
Answer: 3.34*10^22 molecules
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