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Collecting Gas Over Water

Q. A sample of gas contains 0.1400 mol of HCl(g) and 7.000x10^-2 mol of Br2(g) and occupies a volume of 13.3 L. The following reaction takes place: 2HCl(g) + Br2(g) → 2HBr(g) + Cl2(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.

Solved • Jan 23, 2020

Collecting Gas Over Water

Q. When chromium metal is added to nitric acid, the following reaction takes place Cr (s) + 6 HNO₃ (aq) → Cr(NO₃)₃ (aq) + 3 H₂O (l) + 3 NO₂ (g) Calculate the volume of NO₂ gas collected over water at 40.0 °C when 13.9 g of chromium is added to excess nitric acid if the total pressure is 675 torr. The vapor pressure of water at 40.0 °C is 55.3 torr.

Solved • Jan 18, 2020

Collecting Gas Over Water

Q. A 1.05 g sample of a mixture of NaCl (MW 58.45) and NaNO2 (MW 69.01) is reacted with excess sulfamic acid. The sample is 40.00% by mass NaNO2. Only NO2- reacts according to the equation below. The nitrogen gas that is formed is collected over water at a temperature of 22.0°C and the barometric pressure on the day of the experiment was 750.0 mmHg. The vapor pressure of water at 22.0°C is 19.8 mmHg. What is the volume of nitrogen collected?

Solved • Dec 31, 2019

Collecting Gas Over Water

Q. What is the mass percent of NaHCO3 (MW 84.0) in the antacid?

Solved • Dec 29, 2019

Collecting Gas Over Water

Q. An unknown gas was collected over water. Determine the molar mass of the unknown gas if a 0.316 g sample occupies a volume of 56.5 mL at 30 °C. The barometric pressure is 756.0 mmHg.

Solved • Dec 26, 2019

Collecting Gas Over Water

Q. From Chemistry by OpenStax, Chapter 9, Example 9.16, Check Your Learning: A sample of oxygen collected over water at a temperature of 29.0 degrees celsius and a pressure of 764 torr has a volume of 0.560 L. What volume would the dry oxygen have under the same conditions of temperature and pressure?

Solved • Dec 13, 2019

Collecting Gas Over Water

Q. The student collects 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 as 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 at 298 K is 24 torr. What is the number of moles of H2 (g) produced in the reaction?.

Solved • Dec 8, 2019