1. You may use any source you want. Explain how (a) a column of mercury can be u
ID: 960268 • Letter: 1
Question
1. You may use any source you want. Explain how (a) a column of mercury can be used as a barometer (b) the significance of the value "760 mm Hg," (e) to convert pressured measured in mm Hg or torr to pressure in atmospheres. 2. A 0.0020 mol sample of gas is held in a 1.0L cylinder at I atm pressure and 20° C. The cylinder is sealed with a piston, which allows for changes in volume and pressure For each of the following, pick the correct answer and explain your choice. (a) If pressure on the cylinder increases, the temperature of the gas decreases, and all other conditions remain the same, the volume the gas occupies will: unable to determine without more information increase decrease (b) If 0.001 mol of gas is removed, the temperature of the gas is decreased, and volume held constant, the pressure of the gas will: unable to determine without more information increase decrease (c) If the volume of the gas increases, and temperature increases, and the number of moles is constant, the pressure of the gas will: unable to determine without more information decrease increase 3. A sample of nitrogen gas occupies a 2.00-L container at a pressure of 800 torr. If the gas is allowed to expand until its volume is 3.10 L, what is the new pressure of the gas in atmospheres? 4. A container contains a sample of helium under the following conditions: 1.40 bar; 70.0 F 4.00 L. How many moles of gas are in the container? 5. Nickel metal reacts with sulfuric acid in a redox reaction. In an experiment, 1.65 g of nickel reacted with 75.0 mL of 0.100 M sulfuric acid. Hydrogen gas was collected in a 150.0 mL container. The reaction takes place at 20° C. One product of the reaction contained nickel (IV) ion hengrams (a) When the reaction is complete, what will be the pressure of the gas in the container? (b) How many grams of the excess reactant will remain? (Over, please)Explanation / Answer
1. a) A column of mercury can be used as a barometer because
b) millimeter (mm) of Hg is a unit of pressure and it is the extra pressure generated by a column of mercury which is 1 millimetre high. Its value is approximately 1/760 of the atmospheric pressure. Hence "760 mm Hg" is commonly used to denote atmospheric pressure.
c) 1 mm Hg = 1 torr
1 atm = 760 mm Hg
To convert pressure in mm Hg or torr to pressure in atm divide by 760 or multiply by 0.001316
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.