To demonstrate the critical state of a substance, a quantity of liquid (ether) is poured into a test tube for which the volume of the test tube is exactly equal to the critical one. After the demonstration, the test tube is cooled. It turned out that at a certain temperature T, a liquid whose density рж = 1.9рк fills exactly half of the test tube. Determine this temperature. The critical temperature of the ether is Tk = 487 K. Consider that the ether (both gas and liquid) obeys the Van de equation throughout the entire range of parameter changes

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