What is the mole fraction of ethanol in the solution
Question: At 63.5 degrees celsius, the vapor pressure of water is 175 torr and that of ethanol, C2H5OH, is 400 torr. A solution is prepared by mixing equal masses of H20 and C2H5OH. What is the mole fraction of ethanol in the solution?
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If each of the following gas samples have the same temperature and pressure, which sample has the greatest volume? A) 1 gram of O2 B) 1 gram of Ar C) 1 gram of H2 D) all have the same volume E) not enough information
Which concept would explain why the carbon to carbon bond lengths in benzene, C6H6, are identical? a)hybridization b)London dispersion forces c)resonance d)hydrogen bonding
Calculate the standard enthalpy of formation of liquid water (H2O) using the following thermochemical information: 2 C(s) + H2(g) C2H2(g) H = +226.8 kJ CO2(g) C(s) + O2(g) H = +393.5 kJ 2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(l) H = -2599.3 kJ H = kJ
Calculate the molality of C2H5OH in a water solution which is prepare by mixing 50.0 ml of C2H5OH with 100.0 ml of H2O at 20°C. The density of C2H2OH is 0.789g/ml at 20° and water is 0.99970g/ml.
An analysis of drinking water, found it to have 4.5 ppb (parts per billion of arsenic). How many grams of arsenic are in a 3.0 Kg sample of water?
Part A: Thymolphthalein is an indicator that changes color over a range from pH = 9.3 to pH = 10.5 . What is Ka of thymolphthalein. Part B: Alizarin yellow R, Ka=7.9x10^-12
The volume of a gas is 2.50 L, measured at 1.00 atm. What is the pressure of the gas in mmHg if the volume is changed to 9.41 L
Calculate the pH at the equivalence point for the titration of 0.190 M methylamine (CH3NH2) with 0.190 M HCl. The Kb of methylamine is 5.0× 10-4.
Homologous recombination is initiated
If the boiling point of the pure of (S)-(-)-alpa-phenylethylamine is 186-188 degrees Celsius, what is the bp of its enantiomer. What optical rotation would be observed if 3.72 g of (S)-amine were mixed with 3.72 g of the (R)-amine
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