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Collecting Gas Over Water

Q. In an experiment, a student places a small piece of pure Mg (s) into a beaker containing 250. mL of 6.44 M HCl (aq). A reaction occurs, as represented by the equation, Mg(s) + 2HCl(aq) ---> MgCl2(aq) + H2(g) The student collects the H2(g) produced by the reaction and measures its volume over water at 298 K after carefully equalizing the water levels inside and outside the gas-collection tube, a shown in the diagram below. the volume is measured to be 45.6 mL. The atmospheric pressure in the lab is measured as 765 torr, and the equilibrium vapor pressure of water 298 K is 24 torr. What is the pressure inside the tube due to the H2 (g)?

Solved • Dec 8, 2019

Collecting Gas Over Water

Q. a reaction produces .35 L of a gas that is collected over water at 30C. the pressure in the collection flask is measured to be 755 torr. if the vapor pressure of water at this temperature is 31.8 torr, what is the pressure of the collected gas (in torr)? a) 755.0 b) 762.2 c) 786.8 d) 723.2

Solved • Dec 2, 2019

Collecting Gas Over Water

Q. A large piece of aluminum metal was exposed to 20.0 mL of hydrobromic acid producing 91.0 mL of hydrogen gas at 45 degree Celsius and 0.952 atm shown in the figure below. Calculate the concentration of the hydrobromic acid assuming it is the limiting reactant.

Solved • Nov 24, 2019

Collecting Gas Over Water

Q. If 0.500 grams of potassium chlorate decomposed, what volume (in liters) of oxygen gas would be collected over water at a barometric pressure of 743 mm Hg and 25.0 degree Celsius?

Solved • Nov 23, 2019

Collecting Gas Over Water

Q. A 2.00-L sample of O2 (g) was collected over water at a total pressure of 745 torr and 21 °C. When the O2 (g) was dried (water vapor removed), the gas had a volume of 1.95 L at 21 °C and 745 torr. Calculate the vapor pressure of water at 21 °C.

Solved • Nov 18, 2019

Collecting Gas Over Water

Q. Consider the following reaction to generate hydrogen gas: Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g) The hydrogen gas is collected by displacement of water at 35.0 °C at a total pressure of 740 torr. The vapor pressure of water at 35.0 °C is 42 torr. Calculate the partial pressure of H2 (in atm) if 324.4 mL of gas is collected over water from this method.

Solved • Nov 18, 2019

Collecting Gas Over Water

Q. A sample of oxygen gas is collected over water at 25°C and a total pressure of 641 torr. The volume of the gas collected is 500.0 mL. What mass of oxygen is collected? The vapor pressure of water at 25°C is 23.8 torr.

Solved • Nov 18, 2019