The average afternoon air temperature is 27°C in Chicago in July. If the vapor pressure of water is 4 kPa at 27°C, determine the average partial pressure of water (in Pascals) in Chicago air in July.

Gases produced by a chemical reaction can easily be collected over water. To determine the pressure of the dry gas, the vapor pressure of the water at that temperature must be subtracted from the total pressure. 1) Consider the following reaction: Mg(s) + 2 HCI(aq) MgCla(aq) + Ha(g) The total pressure of gas collected over water is 725.0 mmHg and the temperature is 25.5°C What is the pressure of hydrogen gas formed in mmHg? Pressure = mmHg

2. A sample of vapor weighing 0.368 g filled a Florence flask when heated in a water bath at 95.0°C. The actual volume of the flask was 128.4 mL and the barometric pressure was 747 torr. Calculate (a) the volume of the vapor at STP and (b) the molar mass of the volatile liquid. (Use the approach applied in the Introduction and on the data sheet.)

In dry atmospheric air, the four most abundant components are N2, X = 0.808; O2, X = 0.1915; Ar, X = 9.34x10-5; and CO2, X = 4.066x10-4. Calculate the partial pressure of CO2, in torr, under standard atmospheric conditions.

When solid calcium carbonate is reacted with aqueous hydrochloric acid, the products of the reaction include aqueous calcium chloride, liquid water, and gaseous carbon dioxide. Calculate the volume of CO₂ gas (in L) collected over water at 25.0 °C when 25.1 g of calcium carbonate is added to excess hydrochloric acid if the total pressure is 911 mm Hg. The vapor pressure of water at 25.0 °C is 23.8 mm Hg.

Sulfur dioxide reacts with oxygen in the presence of plati- num to give sulfur trioxide: 2 SO2(g) + O2(g) → 2 SO3(g) Suppose that at one stage in the reaction, 26.0 mol SO2, 83.0 mol O2, and 17.0 mol SO3 are present in the reaction vessel at a total pressure of 0.950 atm. Calculate the mole fraction of SO3 and its partial pressure.

Humidity is the percentage of partial pressure of water in air over the total possible water in the air. On the first day of the spring semester the humidity was 72%, but it did not feel humid outside. Calculate the partial pressure of water in air at this time and justify why it did not feel humid. You may find it helpful to compare the first day of the spring semester to the first day of the fall semester, where the humidity was 89% on the first day of class.

A sample of oxygen gas was collected via water displacement. Because the oxygen was collected via water displacement, the sample is saturated with water vapor. The total pressure of the mixture at 26.4 °C is 1.059 bar . Calculate the partial pressure of oxygen. The vapor pressure of water at 26.4 °C is 25.81 mm Hg. Ро, bar

When solid calcium carbonate is reacted with aqueous hydrochloric acid, the products of the reaction include aqueous calcium chloride, liquid water, and gaseous carbon dioxide. Calculate the volume of CO₂ gas collected over water at 25.0 °C when 39.5 g of calcium carbonate is added to excess hydrochloric acid if the total pressure is 911 mm Hg. The vapor pressure of water at 25.0 °C is 23.8 mm Hg.

The sudden appearance of hot gaseous products in a small initial volumeleads to rapid increases in pressure and temperature, which give the rocketits thrust. What total pressure of gas would be produced at 800°C by igniting 7.00 × 105 kg NH4ClO4 (a typical charge of the booster rockets in the space shuttle) and allowing it to expand to fill a volume of 6400 m3 (6.40 × 106L)? Use the ideal gas law