ch 5

Calculate the ratio of the effusion rates of N2 and N2O

1.25

Body temp is about 309 K. On a cold day, what volume of air in 276 K must a person with a lung capacity of 2.2 L breathe in to fill the lungs?

1.97 Liters

A reaction produces a gaseous mixture of carbon dioxide carbon monoxide and water vapor After on reaction the mixture was analyzed and found to contain .6 mol of carbon dioxide .3 mol of carbon monoxide .1 mol of water vapor if the total pressure of the mixture was .8 atmospheres what was the partial pressure of the carbon monoxide

.24 atm

The mass of 1.12 liters of gas Y at STP is found to be 6.23 g. The molar mass of gas is

125 g/mol

A vessel with a volume of 26.9 L contains 2.8 g of nitrogen gas, .0605 g of hydrogen gas, and 79.9 of argon gas. At 25C what is the pressure of the vessel.

2.18 atm

Which of the following is a reasonable estimate for the volume of a balloon that has been filled with 300 grams of oxygen gas at standard temperature and pressure .

200l

Avogadros law states that a. equal amounts of gases occupy the same volume at constant temp and pressure b. the volume of a fixed amount of gas is inversely proportional to its pressure at the constant temperature c. the volume of a fixed amount of

a

Consider the following container ( He box has 7 circles in it and Ar has 7 circles as well) helium at 27C and argon at 27C

the average kinetic energy of the 2 samples are equal

Sample gas he did from 35 degrees Celsius which statement correctly describes what happens to the volume

the volume increased by a factor of less than 2

What is the name of the level of the atmosphere closest to the service of the earth

troposhere

Calculate the root mean square velocity for the O2 moelcules in a sample of O2 gas at 11.8C . (R= 8.3145 J/K mol)

471.2 m/s

Consider a sample of gas in a container on a comfy fall day. The Celsius temp suddenly drops and you transfer the gas to a container with twice the volume for the container. If the original pressure was 12 atm, what is a good estimate for the new pressure

6.4 atm

A sample of methane gas was collected over water at 35 degrees Celsius the sample had a total pressure 756 mmHg. Determine the partial pressure of the methane gas in the sample (the water vapor pressure of water at 35 degrees Celsius is 41mmHg)

715 mmHg

On a cold day near the ocean it was found that 8 grams of an unknown gas occupies a volume that is a little less than 6 liters based on this information what is the most likely identity of the unknown gas CO2 Ne O2 CH4

O2

choose the gas that likely shows the greatest deviation from ideal gas behavior he o2 sf4 SiH4

Sf4

Determine the formula for a gaseous silane (SinH2n+2) if it has a density of 5.47 g per liter at a temperature of 0 C in 1.00 atmosphere of pressure SiH4 Si2H7 si3h8 Si4H10

Si4H10

Charles law states that

The volume of a fixed mass of gas is directly proportional to its kelvin temp if the pressure is kept constant

Increasing the temperature of an ideal gas from 50 degrees Celsius to 75 degrees Celsius at a constant volume will cause which of the following to increase for the gas

the average speed of molecules

Steel tank containing argon gas has additional argon gas pump at constant temperature which of the following is true for the gas in the tank

the gas atoms travel with the same average speed

Hydrogen and Cl gases react to form HCl. You and a friend are on opposite sides of a long hallway, you with H2 and you friend with Cl2. You both want to form Hcl in the middle of the hallway. Which iof the following is true

your friend should release the cl2 first

Consider three flasks 1.00 l fkasks at 25C and 725 torr contains the cases CH4 (flask A), CO2 (f B), C2h6 (f C). In whch flask is there 0.039 mol of gas

all the above

Boyles law states that A. Equal amounts of gases occupy the same volume at constant temp and pressure. B. The volume of a fixed gas is inversely proportional to its pressure at constant temp C. The volume of a fixed amount of gas is directly proportional to its temp in Kelvin at constant pressure D. The total pressure of a mixture of gases is the simple sum of the partial pressure of all the gaseous compounds

b

Consider three flacks. Flask a contains NH3 gas, B has NO2 gas, and C has N2 gas. In what flask are the molecules the least polar and therefore most ideal in the behavior?

flask c

Which is not a postulate of the kinetic molecular theory

gas particles have most of their mass concentrated in the nucleus of the atom

If a Sample of CH4 effuse at a rate of 9.0 mol per hour at 35 degrees Celsius which of the following gas is listed below well effuse at a rate approximately twice the rate of CH for under the same conditions co he o2 f2

he

Which of the following best explains why a hot air balloon rises

hot air has a lower density than cold air

You have 41.6 g of O2 gas in a container with twice the volume as one with CO2 gas. The pressure and temp of both are the same. calculate the mass of carbon dioxide gas you have in the container.

28.6 g

Which of the following gases is expected to behave most ideally at a given temperature and pressure H20 Nh3 Xe He

He