The elemental analysis of an organic solid extracted from gum arabic (a gummy substance used in adhesives, inks, and pharmaceuticals) showed that it contained 40.0 percent by mass C, 6.7 percent by mass H, and 53.3 percent by mass O. A solution of 0.523 g of the solid in 28.1 g of the solvent diphenyl °C gave a freezing-point depression of 1.24 °C. Calculate the molar mass and molecular formula of the solid. (K, for diphenyl is 8.00 —.) m
The elemental analysis of an organic solid extracted from gum arabic (a gummy substance used in adhesives, inks, and pharmaceuticals) showed that it contained 40.0 percent by mass C, 6.7 percent by mass H, and 53.3 percent by mass O. A solution of 0.523 g of the solid in 28.1 g of the solvent diphenyl °C gave a freezing-point depression of 1.24 °C. Calculate the molar mass and molecular formula of the solid. (K, for diphenyl is 8.00 —.) m
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter10: Properties Of Solutions
Section: Chapter Questions
Problem 124CP
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Transcribed Image Text:The elemental analysis of an organic solid extracted from gum arabic (a gummy substance used in adhesives, inks, and pharmaceuticals) showed that it
contained 40.0 percent by mass C, 6.7 percent by mass H, and 53.3 percent by mass O. A solution of 0.523 g of the solid in 28.1 g of the solvent diphenyl
ос
gave a freezing-point depression of 1.24 °C. Calculate the molar mass and molecular formula of the solid. (K, for diphenyl is 8.00
Part 1 of 2
Be sure your answer has the correct number of significant digits.
molar mass:
I
g
mol
×
Part 2 of 2
molecular formula:
×
G
m
Transcribed Image Text:The solubility of KNO3 is 155 g per 100.0 g of water at 75 °C and 38.0 g at 25 °C. What mass of KNO3 will crystallize out of solution if exactly 200.0 g of its
saturated solution at 75 °C is cooled to 25 °C?
Be sure your answer has the correct number of significant digits.
g
x10
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