Data Sheet e I. Masses of Samples (Remember Units) Name 66 26 Mass of Beaker #1

Question

Data Sheet e I. Masses of Samples (Remember Units) Name 66 26 Mass of Beaker #1 Mass of Beaker #1 and mixture 2,013 27.939 Mass of mixture (subtract the first two numbers) Mass of watch glass Mass of watch glass and naphthalene Mass of naphthalene collected Mass of beaker 1 after sublimation Mass of naphthalene by difference *Use for calculations Mass of beaker 2 Mass of beaker 2 and NaCl Mass of NaCI Mass of beaker 1 and dry sand Mass of sand alone 67,744 67,0483 II. Calculations Mass of recovered solids (use this for %'s below Percent recovered (mass of recovered/starting mass X 100) Percent of mixture that is naphthalene (by difference) Percent of mixture that is NaCl Percent of mixture that is sand

Explanation / Answer

Mass of samples

Mass of Beaker #1

66.261 g

Mass of Beaker #1 and Mixture

68.274 g

Mass of Mixture

(68.274 – 66.261) g = 2.013 g

Mass of watch glass

27.993 g

Mass of watch glass and naphthalene

28.144 g

Mass of naphthalene collected

(28.144 – 27.993) g = 0.151 g

Mass of Bear #1 after sublimation

67.744 g

Mass of naphthalene by difference

(68.274 – 67.744) g = 0.53 g

(only naphthalene sublimes, leaving behind NaCl and sand)

Mass of Beaker #2

105.888 g

Mass of Beaker #2 and NaCl

106.547 g

Mass of NaCl

(106.547 – 105.888) g = 0.659 g

Mass of Beaker 1 and dry sand

67.048 g

Mass of sand alone

(67.048 – 66.261) g = 0.787 g

Calculations

Mass of recovered solids

(0.151 + 0.659 + 0.787) g = 1.597 g

Percent recovered

(1.597 g/2.013 g)*100 = 79.334%

Percent of mixture that is naphthalene

(0.53 g)/(2.013 g)*100 = 26.329%

Percent of mixture that is NaCl

(0.659 g)/(2.013 g)*100 = 32.737%

Percent of mixture that is sand

(0.787 g)/(2.013 g)*100 = 39.096%

Mass of Beaker #1

66.261 g

Mass of Beaker #1 and Mixture

68.274 g

Mass of Mixture

(68.274 – 66.261) g = 2.013 g

Mass of watch glass

27.993 g

Mass of watch glass and naphthalene

28.144 g

Mass of naphthalene collected

(28.144 – 27.993) g = 0.151 g

Mass of Bear #1 after sublimation

67.744 g

Mass of naphthalene by difference

(68.274 – 67.744) g = 0.53 g

(only naphthalene sublimes, leaving behind NaCl and sand)

Mass of Beaker #2

105.888 g

Mass of Beaker #2 and NaCl

106.547 g

Mass of NaCl

(106.547 – 105.888) g = 0.659 g

Mass of Beaker 1 and dry sand

67.048 g

Mass of sand alone

(67.048 – 66.261) g = 0.787 g

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