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At 63.5°C, the vapor pressure of H2O is 175 torr, and that of ethanol, C2H5OH, is 400 torr. A solution is made by mixing equal masses of H2O and C2H5OH. (a) What is the mole fraction of ethanol in the solution? (b) Assuming ideal-solution behaviour, what is the vapor pressure of the solution at 63.5°C? (c) What is the mole fraction of ethanol in the vapor above the solution?
Three pure compounds are formed when 1.00 g sample of elements X combine with, respectively, 0.472 g, 0.420 g, and 0.236 g of element Z. The first compound has the formula X2Z3.
What is your sampling rate in ml/min if you collected, over a four hour sample
What is the pH of a 0.15M solution of HCOOH formic acid if the Ka of formic acid HCOOH is 1.8x10^-4 at 25 degrees Celsius.?
Calculate the heat of formation, Hof, of pentane given that the Hof of H2O(l) is -285.3 kJ mol-1 and Hof of CO2(g) is -393.5 kJ mol-1.
Consider a substance X with a Hvap = 20.3 kj/mol and Hfus = 9.0 kj/mol. The melting point, freezing point, and heat capacities of both the solid and the liquid X are identical to those of water
combustion of 1.031g of a compound containing only carbon, hydrogen and oxygen produced 2.265g if carbondioxide and 1.236g of water. What is the empirical formula for the compound?if the molecuar weight is 180.3g, what is the molecular formula?
In which of the following organ does both physical and enzymatic digestion of lipids occur
Two vessels are labeled A and B. Vessel A contains NH3 gas at 73 degrees C and vessel B contains Ne gas at the same temperature. If the average kinetic energy of NH3 is 7.1 10-21 J/molecule at 70 degrees C.
A 0.456 gram sample of an unknown monoprotic acid (let's call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH.
Explain in gory detail the relationship between temperature and vapor pressure. Lots of pictures might be helpful. Why does water expand when it freezes?
ideal gas in 2.0 L what will be the volume of the gas if the pressure on the container is doubled while the temperature is reduced from 400 K to 200 K.
If 5 moles of propane and 10 moles of oxygen are sealed in a container and burned, which reactant will be the limiting reactant, and how many moles of carbon dioxide will be produced?
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