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Please help! Chem QUESTION!?

The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The air pressure in the bottle 257C is 762 mm Hg. If the bottle is submerged in a water bath at 425C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature is ________ mm Hg. Hint: you will have to correct the air pressure at the temperature again by the Gas Law: P1T1 P2T2 = I tried this problem many times with the equation of track but could still get the right answer. Can you explain how your answer? THANK YOU!

To obtain the pressure of ethanol, when not gray: 878 to 762 mm Hg = 116 You temperatures and has a given pressure. Therefore you can begin to replace. According to our teacher, we must use the temperature in degrees Kelvin. Therefore we must add to the 273.15 celcius / centigrade. So ... Temperatures: T1 = 257 + 273.15 = 530.15 = 425 T2 + 273.15 = 698.15 So Therefore: (116 mm Hg) * (530.15 K) = x (698.15 K) x = [(116 mm Hg) * (520.15 K)] / (698.15 K) = x 86.42 mm Hg

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Tags: alcohol, density, distilling, ethanol, still

This entry was posted on Sunday, October 4th, 2009 at 12:08 am and is filed under Water Filters. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.