Freezing_Point_Depression

Freezing_Point_Depression - 16 How much will the freezing...

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FREEZING POINT DEPRESSION PROBLEMS (nonelectrolytes) Table of K f values for solvents Solvent K f (ºC/molal) Solvent K f (ºC/molal) Water -1.86 Benzene -5.12 Ethanol -1.99 Naphthalene -7.00 Chloroform -4.68 11. How many grams of silver would have to be dissolved in 1120 g of ethanol to lower the freezing point by 0.25ºC? 12. What is the freezing point depression when 85.3 g of oxygen gas is dissolved in 1500 g of water? 13. Ethylene glycol (C 2 H 6 O 2 ) is the principal ingredient in antifreeze. How many grams of ethylene glycol will be needed to lower the freezing point of 2100 g of water by 20ºC? 14. How many grams of diphenyl (C 12 H 10 ) must be dissolved in 655 g of benzene to lower the freezing point by 3.20ºC? 15. Perylene (C 20 H 12 ) is a constituent of coal tar. How many grams of perylene must be dissolved in 66.9 g of chloroform in order to lower the freezing point by 2.75ºC?
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Unformatted text preview: 16. How much will the freezing point of 1050 g of benzene be lowered if 31.1 g of orcinol (C 7 H 8 O 2 ) is dissolved in the benzene? 17. What will the freezing point depression if 42.0 g of ibuprofen (C 13 H 18 O 2 ) is dissolved in 975 g of naphthalene? 18. If 13.4 of the pharmaceutical drug scopolamime (C 17 H 21 NO 4 )is dissolved in 50.3 g of water, how much will the freezing point be lowered? 19. How many grams of pyrazole must be added to 451 g of benzene to lower the freezing point by 5.00ºC? 20. If you lower the freezing point of 16.8 g of chloroform by 2.50ºC by using chlorine gas, how many grams of chlorine gas must be dissolved in the chloroform? ANSWERS TO PROBLEMS 11-20: 11) 15.2 g 12) 3.31ºC 13) 1.4 kg 14) 63.0 g 15) 9.91 g 16) 1.22ºC 17) 1.46ºC 18) 1.64ºC 19) 29.9 ºC 20) 0.637 g...
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