A Mass of 12 B) C) D) E)

question 46

Multiple Choice

A mass of 12.0 g of calcium chloride is diluted to a volume of 250 mL in a volumetric flask.Which of the equations below is a correct method for determining the chloride ion concentration?

• A) \(\frac{12.0 \mathrm{~g} \mathrm{~CaCl}_{2}}{250 \mathrm{~mL}}\left(\frac{1000 \mathrm{~mL}}{1 \mathrm{~L}}\right)\left(\frac{1 \mathrm{~mole} \mathrm{CaCl}_{2}}{111.0 \mathrm{~g}}\right)\)
• B) \(\frac{12.0 \mathrm{~g} \mathrm{~CaCl}_{2}}{250 \mathrm{~mL}}\left(\frac{1 \mathrm{~L}}{1000 \mathrm{~mL}}\right)\left(\frac{1 \mathrm{~mole} \mathrm{CaCl}_{2}}{111.0 \mathrm{~g}}\right)\left(\frac{2 \mathrm{~mol} \mathrm{Cl}^{-}}{1 \mathrm{~mol} \mathrm{CaCl}_{2}}\right)\)
• C) \(\frac{12.0 \mathrm{~g} \mathrm{~CaCl}_{2}}{250 \mathrm{~mL}}\left(\frac{1000 \mathrm{~mL}}{1 \mathrm{~L}}\right)\left(\frac{1 \mathrm{~mole} \mathrm{CaCl}_{2}}{111.0 \mathrm{~g}}\right)\left(\frac{2 \mathrm{~mol} \mathrm{Cl}^{-}}{1 \mathrm{~mol} \mathrm{CaCl}_{2}}\right)\)
• D) \(\frac{12.0 \mathrm{~g} \mathrm{~CaCl}_{2}}{250 \mathrm{~mL}}\left(\frac{1 \mathrm{~L}}{1000 \mathrm{~mL}}\right)\left(\frac{1 \mathrm{~mole} \mathrm{CaCl}_{2}}{111.0 \mathrm{~g}}\right)\left(\frac{1 \mathrm{~mol} \mathrm{CaCl}_{2}}{2 \mathrm{~mol} \mathrm{Cl}^{-}}\right)\)
• E) \(\frac{12.0 \mathrm{~g} \mathrm{~CaCl}_{2}}{250 \mathrm{~mL}}\left(\frac{1000 \mathrm{~mL}}{1 \mathrm{~L}}\right)\left(\frac{1 \mathrm{~mole} \mathrm{CaCl}_{2}}{111.0 \mathrm{~g}}\right)\left(\frac{1 \mathrm{~mol} \mathrm{CaCl}_{2}}{2 \mathrm{~mol} \mathrm{Cl}^{-}}\right)\)

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