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# Calculations related to Vaporization & Thermodyamics

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At 100 degrees Celsius and 1.00 bar, 1.00 mol of liquid water is converted to 1.00 mol of gas.
a) Calculate delta Hm, delta Sm and delta Gm. (Look up the standard enthalpy of vaporization at the normal boiling point. Give your source).
b) 1.00 mol of liquid water is placed in a previously evacuated chamber at 100 degrees Celsius. The volume of the chamber is such that it will contain 1.00 mol of gas at a pressure of 50.7 kPa and 100 degrees Celsius. What happens to the liquid water? Calculate delta Hm, delta Sm and delta Gm.

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The solution shows how to deal with numerical problems pertained to thermodyamics and phase change. The solution provides key logical reasons and solves the bottlenecks.

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In each case, find the regression equation, letting the first variable be the predictor (x) variable. Find the indicated predicted value by following the prediction procedure.
Height of Presidents and runners-up
Find the best predicted heights of runner-up Goldwater, given that the height of the winning presidential candidate Johnson is 75 inches. ...

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• "Thankyou for the feedback. I have a few question though; With the first statistic about cost below... “According to Sigma-Aldrich catalog, cost of 1L octane is AUD \$ 392.00, whereas the cost of 1L ethanol is AUD \$196.00. Moreover, if ethanol is obtained from sugar industry as a by-product, it may cost even less. Source of oxygen is ambient atmosphere, so it costs nothing. So ethanol is much cheaper than petrol, in fact it is half-priced: AUD \$ (392-196) = \$ 196.” I didn't think it made sense because the cost of petrol per litre is normally a dollar something or even less than a dollar not a couple of hundred of dollars. For example, a statistic that I found in america was: "U.S. ethanol production costs are about \$1.20 per gallon of ethanol, or \$1.82 per gallon on a gasoline-equivalent basis." However, I was wondering whether you could find an Australian statistic. Also, you mentioned that H20 is not a greenhouse gas. However, in the combustion equations it is actually carbon dioxide and water vapour which are produced and they are both greenhouse gases. Finally, how do I calculate the energy efficiency of ethanol and petrol? "
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