Chapter 11 Review
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All problem solving
Two periods
Calculators and periodic tables
20 questions (5 points each)
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Mole conversions (8)
Percent composition (4)
Empirical and molecular formulas (4)
Hydrates (4)
1. How many molecules of CO2 are in 5.0 mol?
2. How many mol in 6.10 g of nitric acid?
3. How many atoms in 2.03 g of Cu?
4. How many grams in 4.00 x 10 26 molecules
of sodium sulfide?
1. Find percent composition of oxygen in
sulfurous acid.
2. Find percent composition of phosphorus in
zinc phosphite.
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Find for a chemical that is 37.51% C, 4.20 %
H, and 58.29% O. Its molecular weight is
768.56 g/mol.
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Find for a chemical that is 52.11% C, 13.14%
H, and 34.75% O. Molecular weight is 230.39
g/mol.
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A hydrate of Na2SO4 is found to have a mass
of 63.5 grams. After the water is driven off,
the anhydrous weighs 45.99 g. Find the
formula and name of the hydrate.
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A 20.g sample of a hydrate of nickel sulfate
(NiSO4) lost 9.63g of water when heated.
Determine the hydrate’s formula.