Chapter 10, Problem 33P

The partial pressure of water vapor in saturated air at 34 °C is 5.25×10-2 atm. (a) How many molecules of water are in 1.16 cm3 of saturated air at 34 °C? (b) What volume of saturated air at 34 °C contains 0.563 mol of water?

How many grams of ammonia will exert the same pressure as 28 mg of hydrogen sulfide, H2S, in the same container under the same conditions?

In the Dumas-bulb technique for determining the molarmass of an unknown liquid, you vaporize the sample of aliquid that boils below 100 °C in a boiling-water bath anddetermine the mass of vapor required to fill the bulb. Fromthe following data, calculate the molar mass of the unknownliquid: mass of unknown vapor, 1.012 g; volume of bulb,354 cm3; pressure, 742 torr; temperature, 99 °C.

For many purposes we can treat dimethyl ether C2H6O as an ideal gas at temperatures above its boiling point of −24.°C. Suppose the pressure on a 480.mL sample of dimethyl ether gas at 4.00°C is doubled. Is it possible to change the temperature of the dimethyl ether at the same time such that the volume of the gas doesn't change? If you answered yes, calculate the new temperature of the gas. Round your answer to the nearest °C.

73. A 500.-mL sample of O2 gas at 24 °C was prepared by decomposing a 3% aqueous solution of hydrogen peroxide, H2 O2, in the presence of a small amount of manganese catalyst by the reaction 2H2 O2 (aq) → 2H2O (g) + The oxygen thus prepared was collected by displacement of water. The total pressure of gas collected was 755 mm Hg. What is the partial pressure of O2 in the mixture? How many moles of O2 are in the mixture? (The vapor pressure of water at 24 °C is 23 mm Hg.)

In the Dumas-bulb technique for determining the molar mass of an unknown liquid, you vaporize the sample of a liquid that boils below 100 °C in a boiling-water bath and determine the mass of vapor required to fill the bulb (see drawing (Figure 1)). Part A unknown vapor, 1.013 g ; volume of bulb, 355 cm3 ; From the following data, calculate the molar mass of the unknown liquid: mass pressure, 742 torr ; temperature, 99 °C ΑΣφ. ? MM = g/mol Submit Request Answer

Commercial scuba divers use tanks filled with a mixture of gases known as Trimix on very long, deep dives. Trimix is composed of 70% nitrogen, 10% oxygen, and 20% helium. The total pressure of TRIMIX inside a certain tank is at the beginning of a dive is 118.4atm. What is the partial pressure of oxygen in a tank?

When zinc metal is added to hydrochloric acid, the following reaction takes place Zn(s) + 2 HCI(aq) → ZnCl2(aq) + H2(g) Calculate the volume of H2 gas collected over water at 30.0 °C when 65.7 g of zinc is added to excess hydrochloric acid if the total pressure is 695 torr. The vapor pressure of water at 30.0 °C is 31.8 torr.

Elemental analysis of an organic liquid with a fishy odour gives the following elemental mass percentages: H 14.94 % C 71.22% N 13.84 %. Vaporization of 270 mg of an impure sample in a 150-mL bulb at 150oC gives a pressure of 435 torr. What is the molecular formula of the compound, and the % purity of the sample?