Question

Name TUTTI Chemistry 219 Homework Assignment #12 - Physical States of Matter & som Matter & Solutions Atoms Focused Approach, 2 ed. by libert, NOS Kead and outline Chapter 10.6.10.10 of Chemistrn Foster, & Bretz as directed by your instructor. Ideal Gases and the Gas Laws 1. How many moles of air must there be in a racing bicycle tire with a volume of 2.36 L if it has an internal pressure of 6.8 atm at 17.0°C? (10.69) 2. The German airship Hindenburg made several transatlantic crossings in the early 1930s before a fiery crash in Lakehurst, New Jersey, in 1937 sealed the fate of "lighter-than-air" dirigibles. The Hindenburg held 1.6 x 10 kg of hydrogen gas. What was the volume of the hydrogen in the Hindenburg at 18°C and 0.98 atm? (10.72) 3. Suppose the atmospheric temperature and pressure at the top of a ski run are -5°C and 713 mmHg respectively. At the bottom of the run, the temperature and pressure are 0°C and 734 mmHe respectively. How many more moles of oxygen does a skier take in with a lungful of air at the bottom of the run than at the top? Express your answer as a percentage. (10.75) Name: Mina Na Chemistry 219 Unit 3 Homework Assignment #12 September 2017

Answer 1

1) Using ideal gas equation,

Number of moles, n = PV/RT

P = 6.8 atm

R = 0.082 Latm/mol.K

V = 2.36 L

T = 17°C = 17+273.15 = 290.15 K

Number of moles = 6.8×2.36/0.082×290.15

= 0.67 moles

2) P = 0.98 atm

T = 18°C = 18+273.15 = 291.15 K

Moles = mass /molar mass = 1.6×10⁴/2

= 0.8×10⁴ Kg = 8×10⁶ g

Volume, V= nRT/P = 8×10⁶×0.082×291.15/0.98

= 194×10⁶ L