workshop practice gas exam f04 v2 key

workshop practice gas exam f04 v2 key - Name Gas Exam Chem...

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Name___________________________________ Gas Exam Chem 111, Fall 2004 – You must show your work to get credit for an answer. 1. (10 pts) A sample of an unknown gas has a density of 1.42 g/L at 32 º C and a pressure of 70.7cm Hg. What is the molecular weight of the gas? Using the fact that n = g/MW an PV=nRT mol g PV RT g MW / 38 ) 0 . 76 / 7 . 70 ( ) 305 )( 082 . 0 ( 42 . 1 * = = = 2. (10 pts) Would you expect CH 3 OCH 3 (g) or CH 3 CH 2 CH 2 CH 2 OH(g) to behave more like an ideal gas? Give two reasons to defend your choice if you can. CH 3 OCH 3 (g) is smaller and has weaker intermolecular forces than CH 3 CH 2 CH 2 CH 2 OH(g), which can hydrogen bond. So CH 3 OCH 3 (g) is more likely to behave as an ideal gas. 3. (10pts) Consider a volume (liters) vs. temperature (K) plot for neon. If you plot the volume on the y-axis and the temperature on the x-axis, what would be the numerical value of the slope if you had 0.20 g of neon gas at 741 mm Hg? What would the units on the slope be? V = (nR/P)T = [0.10(0.082)/(0.975)] T = {0.0084)T
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workshop practice gas exam f04 v2 key - Name Gas Exam Chem...

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