CHEM 101 Recitation_Week 10-done

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Jan 9, 2024

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CHEM 101 – Recitation Week 10 Ch. 10, 26. The pressure on top of Mount Everest (29,029 ft or 8848 m) averages about 235 mm Hg. Covert this pressure to Concepts: unit conversion, difference between units of pressure 1 atm = 760 mm Hg 1 atm = 14.7 psi 1 atm = 760 torr a. torr b . psi d. atm Ch. 10, 30. If the barometric pressure is 751.5 mm Hg, what is the pressure of the gas sample shown in each illustration? Concepts: Boyles Law, barometric pressure; pressure exerted by the earths atmosphere Ch. 10, 34. A syringe containing 1.55 mL of oxygen gas is cooled from 95.3 °C to 0.0 °C. What is the final volume of the oxygen gas? Concepts: the relationship between volume and temp, Charles law Ch. 10, 36. A cylinder with a moveable piston contains 0.553 mol of gas and has a volume of 253 mL. What is its volume of we add 0.365 mol of gas to the cylinder? (Assume constant temperature and pressure.) Concepts: conversion between moles and volume, Avogadro’s constant Ch. 10, 44. A weather balloon is inflated to a volume of 28.5 L at a pressure of 748 mm Hg and a temperature of 28.0 o C. The balloon rises in the atmosphere to an altitude of approximately 1

25,000 ft., where the pressure is 385 mm Hg and the temperature is -15.0 o C. Assume the balloon can freely expand, calculate the volume of the balloon at this altitude. Ch. 10, 58. A 113-mL gas sample has a mass of 0.171 g at a pressure of 721 mm Hg and a temperature of 32 o C. What is the molar mass of the gas? (R = 0.0821 L∙atm/(mol∙K)). Concepts: conversion between moles and volume, pressure unit conversion Ch. 10, 65 . A gas mixture contains 1.25 g N 2 and 0.85 g O 2 in a 1.55-L container at 18 o C. Calculate the mole fraction and partial pressure of each component in the gas mixture. Concepts: mole fraction, partial pressure Ch. 10, 85. Automobile air bags inflate following serious impacts, which trigger the chemical reaction: 2 NaN 3 ( s ) → 2 Na ( s ) + 3 N 2 ( g ). If an automobile air bag has a volume of 11.8 L, what mass of NaN 3 (in g) is required to fully inflate the air bag upon impact? Assume STP conditions (T = 0 o C, P = 1 atm). MW of NaN 3 is 65.0 g/mol. Concepts: standard temp/pressure, stoichiometry 2

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