Test
Ch 12
Preguntas del test (5)
1Consider the solubilities of the following organic compounds in water. Which ranking of decreasing solubility is probably correct (the most soluble first, etc.)?
1) CH3CH2OH
2) CH3(CH2)4CH3
3) CH3(CH2)5CH2OH
4) CH3(CH2)4CH2- A1 > 3 > 4 > 2
- B3 > 1 > 4 > 2
- C3 > 4 > 1 > 2
- D1 > 4 > 3 > 2
2What is the molarity of 25.0 g of KBr in 456 mL of water solution?
- A0.210 M
- B4.61 x 10^-4 M
- C 0.921 M
- D0.461 M
- E54.8 M
3At 63.5°C the vapour pressure of H2O is 175 torr, and that of ethanol, C2H5OH, is 400. torr. A solution is made by mixing equal masses of H2O and C2H5OH. What is the mole fraction of ethanol in the solution, and assuming ideal-solution behaviour, what is the vapour pressure of the solution at 63.5°C?
- AXethanol = 0.281, P = 238 torr
- BXethanol = 0.500, P = 200 torr
- C Xethanol = 0.500, P = 188 torr
- DXethanol = 0.281, P = 112 torr
- EXethanol = 0.719, P = 288 torr
- FXethanol = 0.719, P = 337 torr
4The solubility of Cr(NO3)3 • 9H2O in water at 15°C is 208 g per 100. mL of solution. Is a 1.22 M solution of Cr(NO3)3 • 9H2O in water at 15°C saturated, supersaturated, or unsaturated?
- A
unsaturated - Bsupersaturated
- Csaturated
- A
5What is the molality of a solution prepared by mixing 25.0 g ethylene glycol (molar mass = 62.1; CH2OHCH2OH) with 125 g of water?
- A.0756m
- B0.0891m
- C.0487m
- D.0325m
Información
- Descripción
- Test sobre Ch 12, creado por Michael Haas el 09/02/2014.
- Autor
- Michael Haas
- Idioma
- English
- Visitas
- 39
- Valoración
- Aún sin valoraciones Valora este test