Collected over water

A 1.500-g sample containing sodium nitrate was heated to form NaN02 and 02. The oxygen evolved was collected over water at 23°C and 752 mm Hg its volume was 125.0 mL. Calculate the percentage of NaN03 in the sample. The vapor pressure of water at 23°C is 21.07 mm Hg. 

A sample of nitrogen is collected over water at 18.5°C. The vapor pressure of water at 18.5°C is 16 mm. When the pressure on the sample has been equalized against atmospheric pressure, 756 mm, what is the partial pressure of nitrogen What will be the partial pressure of nitrogen if the volume is reduced by a factor 740/760 ... 

Self-Test 4.13A As a sample of oxygen was collected over water at 24°C and 745 Torr, it became saturated with water vapor. At this temperature, the vapor pressure of water is 24.38 Torr. What is the partial pressure of the oxygen ... 

Dinitrogen oxide, N20, gas was generated from the thermal decomposition of ammonium nitrate and collected over water. The wet gas occupied 126 mL at 21°C when the atmospheric pressure was 755 Torr. What volume would the same amount of dry dinitrogen oxide have occupied if collected at 755 Torr and 21°C The vapor pressure of water is... 

When 0.40 g of impure zinc reacted with an excess of hydrochloric acid, 127 mL of hydrogen was collected over water at 10.°C. The external pressure was 737.7 Torr. (a) What volume would the dry hydrogen occupy at 1.00 atm and... 

A. How much time is required to collect 20.0 1 of chlorine if the gas is collected over water at 20.0°C and the total pressure is 770. Torr Assume that the water is already saturated with chlorine, and so no more dissolves. See Table 8.3 for the vapor pressure of warer. 

The total pressure of a 200-mL sample of oxygen collected over water at 25 °C is 1.030 atm. (a) How many moles of gas is present (b) How many moles of oxygen is present (c) How many moles of water vapor is present ... 

This answer assumes the H2(g) is not collected over water, and that the H2(g) formed is the only gas present in the container (i.e. no water vapor present)... 

Another type of gas law problem involves stoichiometry. Gas stoichiometry problems are just like all other stoichiometry problems—you must use moles. In addition, one or more gas laws are necessary. Let s look at a gas stoichiometry problem. What volume, in liters of oxygen gas, collected over water, forms when 12.2 g ofKCl03 decompose according to the following equation ... 

The decomposition of NaN3 will generate N2 gas. A 8.25 L sample of gas was collected over water at 25°C and at a total pressure of 875 torr. How many grams of NaN3 reacted The vapor pressure of water, at 25°C, is 24 torr. 

If the ethylene produced with sulphuric acid is analysed (method ) it is found that very much carbon monoxide is present. The phosphoric acid method is better suited for the production of the pure gas, but the best way is to remove with zinc dust and glacial acetic acid the bromine from the ethylene dibromide already prepared. The dibromide is dropped into a suspension of an excess (not too great) of zinc dust in alcohol and glacial acetic acid (2-5 moles) and the ethylene is collected over water in a gas-holder. 

First, you need to determine the pressure of just the oxygen gas. It was collected over water, so the total pressure of 755.0 torr is the sum of the partial pressures of the oxygen and the water vapor ... 

A sample of methane gas was collected over water at 35°C. The sample was found to have a total pressure of 756 mm Hg. Determine the partial pressure of the methane gas in the sample (vapor pressure of water at 35°C is 41 mm Hg). 

Measure the mass, volume, temperature, and pressure of an insoluble gas collected over water. 

The flask is connected to a reflux condenser to condense down solvent ether back into the flask. Phosphine is collected over water as a moist gas. Dry phosphine may alternatively be condensed in a U-tube placed in freezing mixture. 

Since Priestley found that some gases can he collected over water while others require mercury (41), he concluded that there must be different kinds of airs. On August 1, 1774, he heated mercuric oxide... 

A 250 ml flask is filled with oxygen, collected over water at a barometric pressure of 730 torr and a temperature of 25°C. What will be the volume of the oxygen sample, dry, at standard conditions ... 

A sample of nitrous oxide is collected over water at 24CC anc torr volume is 235 ml. What is the volume at standard conditions ... 

A 375 ml sample of hydrogen is collected over water at 18 C and 720 torr What is its volume at standard conditions7... 

What will be the difference in volume occupied by 0 100 g of hydrogen at 740 torr and 19°C if it is collected over water instead of mercury7... 

What volume of 02, collected over water at 735 torr and 20°C, can be produced from 4 00 lb of sodium peroxide, Na202, according to the reaction... 

H2O2 is catalytically decomposed by the presence of I. The accompanying data are obtained at 20.0 C with a 0.250 M H202 soiution in the presence of 0.030 M 1. The reaction flask containing 50.0 ml of reaction mixture is connected to a gas buret, and the rate is followed at a series of time intervals after mixing by measuring the volume (V) of 02 collected over water at a barometric pressure of 730.0 torr. The reaction is... 

It is possible to follow the rate of the reaction by measuring the volume V of N2 produced at a given temperature and pressure The following data are obtained at 50 0°C using 35 0 ml of a 0 0672 M solution of B The N2 gas is collected over water in a gas buret where the temperature is 14 0°C The barometric pressure is 745 torr From these data, determine the order of the reaction and rate constant... 

The most satisfactory way to collect a gas is by upward displacement over mercury, if mercury is available and if the gas is unreactive toward it. If a gas is collected over water, don t bother to dry it first. Of course, collection over... 

The liberated oxygen is collected over water. The reaction occurs at room temperature. 

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