Peer Leader: Date: For all problems involving calculations, show your work. Carry the units through each calculation and follow significant figure rules. 1. atm 2.44 mmHg 452 Torr 960 kPa 237 PSI 20.7

A marine biologist is preparing a deep-sea submersible for a dive. The sub stores breathing air under high pressure in a spherical air tank that measures 81.0 cm wide. The biologist estimates she will need 3900. L of air for the dive. Calculate the pressure to which this volume of air must be compressed in order to fit into the air tank. Write your answer in atmospheres. Be sure your answer has the correct number of significant digits. atm

The air that we breath contains about 21%  gas. If the atmospheric pressure in Calgary is 89 kPa, what is the partial pressure of the  gas surrounding you?  Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 21 kPa b 19 kPa c 70 kPa d 108 kPa

Convert 1.25 atm to bar. 1.27 bar 1.23 bar O 0.975 bar O 0.7874 bar O 1.25 bar

Three samples of three different gases are listed in the table below. All the samples contain exactly 1 mole of gas and are at a temperature of 0.0°C. For each sample, decide whether the gas can be reasonably described as an ideal gas. If the gas isn't ideal, decide the most important reason why it isn't. sample A B C pressure (atm) 2.7 1.5 0.75 volume (L) 10.0 20.0 30.0 ideal? O yes O no O yes O no O yes O no If not ideal, the most important reason why not: O There are attractions between the particles. O The particles don't have zero volume. There are attractions between the particles. O The particles don't have zero volume. There are attractions between the particles. O The particles don't have zero volume. X Ś

Three samples of three different gases are listed in the table below. All the samples contain exactly 1 mole of gas and are at a temperature of -10.0°C. For each sample, decide whether the gas can be reasonably described as an ideal gas. If the gas isn't ideal, decide the most important reason why it isn't. sample A B C pressure (atm) 1.3 0.72 0.54 volume (L) 20.0 30.0 40.0 ideal? O yes O no O yes O no O O O yes O no If not ideal, the most important reason why not: O There are attractions between the particles. O The particles don't have zero volume. O There are attractions between the particles. O The particles don't have zero volume. O There are attractions between the particles. O The particles don't have zero volume. X Ś

Three samples of three different gases are listed in the table below. All the samples contain exactly 1 mole of gas and are at a temperature of -5.0°C. For each sample, decide whether the gas can be reasonably described as an ideal gas. If the gas isn't ideal, decide the most important reason why it isn't. sample A B C pressure (atm) 1.1 0.59 0.50 volume (L) 20.0 30.0 40.0 ideal? yes O no O yes O no O yes O no If not ideal, the most important reason why not: O There are attractions between the particles. O The particles don't have zero volume. There are attractions between the particles. O The particles don't have zero volume. O There are attractions between the particles. O The particles don't have zero volume. X 5

1. A gas occupies 18.5 L at STP. What volume will it occupy at 735 torr and 57°C? 23.1 L              a. A gas occupies 32.6 L at 2.00 atm pressure and 27°C. Calculate its volume if the pressure remains at 2.0 atm but the temperature is raised to 54°C.

Rank the samples of gas described in the table below in order of increasing average speed of the atoms or molecules in them. That is, select "1" next to the sample in which the atoms or molecules have the slowest average speed. Select "2" next to the sample in which the atoms or molecules have the next slowest average speed, and so on. gas sample 2.4 mol of argon gas at 2.3 atm and -20. °C 2.3 mol of krypton gas at 3.0 atm and -43. °C 1.5 mol of krypton gas at 2.4 atm and -20. °C 1.0 mol of neon gas at 2.7 atm and -20. °C average speed of atoms or molecules (Choose one) (Choose one) (Choose one) (Choose one)

Solve and explain sample 4 and 5