CHM assignment 4

CHM assignment 4 - in 22.41 L at 0.0 º C[12 9 Water is not...

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Assignment 4- answers Score Total 100 1. Which molecule has the largest dipole moment? [5] A. B. C. D. 2. Which compound has the highest boiling point? [5] CH 4 , CH 3 OH, CH 3 CH 3 Which compound has the lowest boiling point? CH 4 , CH 3 OH, CH 3 CH 3 3. Arrange the following compounds in order from the lowest melting point to the highest melting point: [5] CaO, dimond, H 2 O, CHCl 3 , C 2 H 6 , He 4. Arrange the following substances in the order of increasing volatility. Explain your answer. CH 4, CBr 4, CH 2 Cl 2, CH 3 Cl, CHBr 3, CH 2 Br 2 [5] 5. It took 4.5 minutes for 1.0 L helium to effuse through a porous barrier. How long will it take for 1.0 L Cl 2 gas to effuse under identical conditions? [8]

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6. Argon gas in a 35.8 L cylinder is transferred to an evacuated cylinder of capacity 1875 L at constant temperature. If the final pressure in the tank is 721 mm Hg what must have been the original pressure (in atm) in the cylinder [8] 7. Calculate the density of HBr gas in g/L at 733 mm Hg at 46ºC [8] 8. Use the van der Waals equation to calculate the pressure exerted by 100.0 mol of oxygen gas
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Unformatted text preview: in 22.41 L at 0.0 º C [12] 9. Water is not a very good ideal gas, which is why it tends to be a liquid at STP. For water vapor, the van der Waals constants are a = 5.46 L 2 atm/mol 2 and b = 0.0305 L/mol. If water were an ideal gas, one mole of water vapor would occupy 22.41 L of volume at 273.2 K and 1.000 atm. What pressure does one mole of water vapor actually exert at this temperature, if the volume is 22.41 L? [12] 10. . Hydrolith (CaH 2 ) reacts with water to produce hydrogen gas. How many grams of hydrolith are needed to produce 10 L of hydrogen gas at 740 mm Hg at 23 ºC. [12] 11. NO(g) and O 2 (g) are separated as shown below. When the valve is opened reaction takes place to produce NO 2 (g). Determine the identity of the gas at the end of the reaction and their partial pressures. Assume that the reaction takes place at room temp. [20]...
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CHM assignment 4 - in 22.41 L at 0.0 º C[12 9 Water is not...

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