1. When doing gas law problems, we always use the temperature scale. 2. -32 degr
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Question
1. When doing gas law problems, we always use the temperature scale. 2. -32 degree C equals K. 3. If I dissolve one teaspoon of sugar in a glass of water. the solute is the 4. The boiling point of a liquid can be decreased by decreasing the pressure above the liquid - the atmospheric pressure (True/False) 5. If two liquids dissolve in each other in ail proportions, they are said to be (miscible / immiscible) 6 What is the molarity of a solution prepared by dissolving 4.92 g of calcium nitrate, Ca(NO3)2, in 250 mL of water ? (The molar mass of Ca(NO3)2 is 164 g/mol.) 7. The energy required to change one mole of a liquid to one mole of a gas at constant temperature and pressure is called 8. The volume of an ideal gas is 3.09 L at standard temperature and pressure Calculate the volume at 1.75 atm and 27 degree C. 9. What volume (in liters) is occupied by 0.1 moles of carbon dioxide, CO2, at 19 degree C and 1.6 atm? 10. Benzene, C6H6, has a molar heat of vaporization of 30.8 kJ/mole. How many kilojoules(kJ) of energy are required to vaporize 5 g of ethane? (Watch your units!) 11. When something is volatile, It evaporates readily Do volatile liquids have high or low vapor pressures?Explanation / Answer
1. Kelvin
2. 241K
3. Sugar
4. False
5. Miscible
6. Molarity =no of moles *1000
Vol of solution
=4.94/164 *1000
250
=0.12 M
7. Heat of vaporization
8. P1V1=P2V2
1/100000*3.09=1.75*101.325 V2
3.09x10-5=177.3V2
V2=1.74x10-5 ml.
9. PV=nRT
1.6*V=0.1*8.314*282
V=234.4./1.6
=146.5ml
10. 10.26
11. 2.85
12. High
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