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MOLE-O!
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M 12345678 12345678 O 12345678 12345678 910111213141516 910111213141516 L 12345678 12345678 E 12345678 12345678
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M–1 Question If your empirical formula is CH 3 and your molar mass is 45.0 g/mole, what is your molecular formula? Answer Answer
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M-2 Question If your empirical formula is CH 2 and your molar mass is 28.0 g/mole, what is your molecular formula? Answer Answer
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M-3 Question If your empirical formula is CH 2 O and your molar mass is 360.0 g/mole, what is your molecular formula? Answer Answer
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M-4 Question If your empirical formula is CH 3 and your molar mass is 60.0 g/mole, what is your molecular formula? Answer Answer
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M-5 Question If your empirical formula is CH 2 and your molar mass is 42.0 g/mole, what is your molecular formula? Answer Answer
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M-6 Question If your empirical formula is CH 2 O and your molar mass is 180.0 g/mole, what is your molecular formula? Answer Answer
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M-7 Question If your empirical formula is CH 3 and your molar mass is 30.0 g/mole, what is your molecular formula? Answer Answer
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M-8 Question If your empirical formula is CH 2 O and your molar mass is 90.0 g/mole, what is your molecular formula? Answer Answer
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O-1 Question What is the volume (in L) of 52.0 grams of NH 3 at STP? Answer Answer
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O-2 Question How many formula units are contained in 0.285 grams of potassium hydroxide? Answer Answer
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O-3 Question You have 8.3 X 10 8 atoms of zinc. How many moles is this? Answer Answer
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O-4 Question What is the molar mass of calcium nitrate? Answer Answer
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O-5 Question What is the molar mass of copper (II) nitrate? Answer Answer
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O-6 Question You have 264 grams of sodium hydroxide. How many moles is this? Answer Answer
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O-7 Question You have 1.2 grams of sodium. How many atoms is this? Answer Answer
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O-8 Question What is the volume (in L) of 4,260 atoms of Neon at STP? Answer Answer
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O-9 Question What is the volume (in L) of 0.847 grams of carbon dioxide at STP? Answer Answer
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O-10 Question What is the mass (in grams) of 0.035 moles of chromium (II) chloride? Answer Answer
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O-11 Question What is the mass (in grams) of 1.74 X 10 16 formula units of sodium hydroxide? Answer Answer
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O-12 Question How many molecules are contained in 26 grams of water? Answer Answer
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O-13 Question What is the mass of 3 atoms of helium? Answer Answer
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O-14 Question What is the volume (in L) of 56.27 grams of nitrogen dioxide at STP? Answer Answer
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O-15 Question What is the mass of 3,720 molecules of O 2 gas? Answer Answer
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O-16 Question What is the mass (in grams) of 263 L of dinitrogen pentoxide at STP? Answer Answer
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L-1 Question A 1.023 gram sample of hydrated copper (II) sulfate, CuSO 4 X H 2 O, is heated to remove all the water and produce 0.653 grams of the anhydrous salt. What is the value of “X?” AnswerAnswer
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L-2 Question What is the percent water in copper (II) nitrate trihydrate? Answer Answer
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L-3 Question What is the percent water in nickel (II) chloride hexahydrate? Answer Answer
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L-4 Question Hydrated calcium sulfate, CaSO 4 X H 2 O, contains 20.93% water. What is the value of “X?” Answer Answer
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L-5 Question Borax powder has the formula Na 2 B 4 O 7 X H 2 O. When 2.145 grams of the hydrate are heated and the water is removed, 1.130 grams of anhydrous salt remain. What is the value of “X?”AnswerAnswer
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L-6 Question What is the percent water in magnesium nitrate hexahydrate? Answer Answer
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L-7 Question What is the percent water in barium chloride dihydrate? Answer Answer
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L-8 Question If 1.687 grams of epsom salt, MgSO 4 X H 2 O, is heat to remove all water, 0.824 grams of salt remain. What is the value of “X?” Answer Answer
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E-1 Question What is the percent lead in lead (II) chloride? Answer Answer
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E-2 Question What is the percent potassium in potassium dichromate? Answer Answer
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E-3 Question What is the empirical formula of a compound composed of 77.7% iron and 22.3% oxygen? Answer Answer
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E-4 Question What is the empirical formula of a compound composed of 44.0% iron and 56.0% chlorine? Answer Answer
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E-5 Question What is the empirical formula of a compound composed of 34.4% iron and 65.6% chlorine? Answer Answer
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E-6 Question What is the percent sulfur in iron (II) sulfide? Answer Answer
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E-7 Question What is the percent sodium in sodium sulfate? Answer Answer
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E-8 Question What is the empirical formula of a compound composed of 69.9% iron and 30.1% oxygen? Answer Answer
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M-1 Answer C3H9C3H9
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M-2 Answer C2H4C2H4
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M-3 Answer C 12 H 24 O 12
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M-4 Answer C 4 H 12
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M-5 Answer C3H6C3H6
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M-6 Answer C 6 H 12 O 6
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M-7 Answer C2H6C2H6
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M-8 Answer C3H6O3C3H6O3
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O-1 Answer 68.5 L NH 3
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O-2 Answer 3.06 x 10 21 formula units KOH
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O-3 Answer 1.14 x 10 -15 moles Zn
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O-4 Answer 164.1 g/mole Ca(NO 3 ) 2
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O-5 Answer 187.5 g/mole Cu(NO 3 ) 2
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O-6 Answer 6.6 moles NaOH
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O-7 Answer 3.1 x 10 22 atoms Na
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O-8 Answer 1.59 x 10 -19 L Ne
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O-9 Answer 0.431 L CO 2
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O-10 Answer 4.3 grams CrCl 2
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O-11 Answer 1.16 x 10 -6 grams NaOH
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O-12 Answer 8.7 x 10 23 molecules H 2 O
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O-13 Answer 1.99 x 10 -23 grams He
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O-14 Answer 27.4 L NO 2
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O-15 Answer 1.98 x 10 -19 grams O 2
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O-16 Answer 1,268 grams N 2 O 5
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L-1 Answer 22.4% H 2 O
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L-2 Answer 22.4% H 2 O
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L-3 Answer 45.4% H 2 O
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L-4 Answer CaSO 42H 2 O
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L-5 Answer Na 2 B 4 O 710H 2 O
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L-6 Answer 42.1% H 2 O
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L-7 Answer 14.7% H 2 O
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L-8 Answer MgSO 47H 2 O
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E-1 Answer 74.48% Pb
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E-2 Answer 26.58% K
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E-3 Answer FeO
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E-4 Answer FeCl 2
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E-5 Answer FeCl 3
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E-6 Answer 36.52% S
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E-7 Answer 32.37% Na
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E-8 Answer Fe 2 O 3
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