14.3: Mole and Mass Fractions
Chapter
	University of Arkansas at Little Rock Dr. Robert Belford & Rebekah Reinhart

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Question 1 1. Calculate the mole fraction of methane in a 10.0L flask containing 0.367 moles of methane, 0.221 moles hydrogen, and 0.782 moles carbon dioxide. (A)  0.448 (B)  0.268 (C)  0.802 (D)  none of the above   Hint Your response Not answered yet

Question 2 2. If the mole fraction for nitrogen in a gaseous mixture were 0.565 and the total number of moles present were 2.49 moles, how many moles of nitrogen are present? (A)  2.20 moles (B)  0.896 moles (C)  1.41 moles (D)  none of the above   Hint Your response Not answered yet

Question 3 3. Calculate the Mass percent if 7.50g CaCl2 were placed in 500mL of water. The density of water is 1.0g/mL. (A)  22.6% (B)  1.48% (C)  89.4% (D)  none of the above   Hint Your response Not answered yet

Question 4 4. If a scientist needed a NaCl solution that had a mass percent of 2.83%, how many grams of NaCl must be added to 1.00 L of water? (A)  29.1g (B)  3.68g (C)  12.5g (D)  none of the above   Hint Your response Not answered yet

Question 5 5. If 0.589g of KCl is added to a solvent, a masspercent of 0.482 is measured. How many grams of solvent must be present. (A)  0.482g (B)  0.568g (C)  0.633g (D)  none of the above   Hint Your response Not answered yet