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A solution contains 0.115 mol H2O and an unknown number of moles of sodium chloride. The vapor pressure of the solution at 30 degrees C is 25.7 torr. The vapor pressure of pure water at 30 degrees C is 31.8 torr. Calculate the number of moles of sodium chloride in the solution.
If an audiotape playing at a speed of 1.875 in. s -1 takes 45.0 min to play through one side, what is the length of the tape in feet. in meters.
a student designs an ammeter a device that measures electricalcurrent that is based on the electrolysis of water into
Specified the refraction index of yellow light to be 1.50 with glass, 1.33 with water and 1.00 with air, Explain what is the % loss of intensity when light passes through a glass cell filled with water.
Compute the vapor pressure at 25 °C if it is given that the density of H 2 O=0.9971 g/mL , vapor pressure of H 2 O=23.76 torr, molar mass of sucrose, = 342.3 g/mol,
hours in the presence of a certain concentration of an acid catalyst, what is the half-life for this reaction under the same conditionns? (Rate = k[C12H22O11]
What is the difference between electron geometry and molecular geometry? How can knowing both assist in determining whether a molecule is polar or nonpolar?
Cl2(g) + F2(g) 2 ClF(g) Kc = 19.9 For the reaction forming ClF the initial concentrations are as follows: [Cl2] = 0.5 M ; [F2] = 0.2 M ; [ClF] = 7.3 M Is the reaction at equilibrium? If not, in which direction with the reaction shift to reach eq..
a chemical reaction produced .311 g sample of gas which occupied 225 mL at 55 degrees C exerting a pressure of 86 mm Hg. what is the molar mass of the gas?
How abundant are tryptophan and cysteine in proteins and what characteristics of these amino acids affect their abundance in proteins
a 10 ml sample of a solution of pbclo32 was diluted with water to 170 ml. a 100 ml sample of the dilute solution was
The specific rotation, [?]D, for (+)-tartaric acid is +12. What is the observed rotation for a solution of 0.75 g of (+)-tartaric acid in 10 mL of water in a sample tube having a pathlength of 10 cm?
What is the new boiling point of water if you add 188 grams of magnesium chloride to 1250 g of water.
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