1. Oxygen gas is collected over water at 22.0 degree C. The pressure in the coll

Question

1. Oxygen gas is collected over water at 22.0 degree C. The pressure in the collection bottle is equilibrated with atmospheric pressure, which is measured to be 749.8 torr. What is the pressure of O2 in the collection bottle? 2. Calculate the value for Rexp which is indicated by the following measurements on a sample of carbon dioxide gas, CO2. Assume the limits of error are delta R = +- 0.005 L atm/mol K What does this experiment indicate about the ideally of CO2 gas under the experimental conditions?

Explanation / Answer

Here we find total pressure and then subtract pressure of water at 22 deg

We subtract the presure of water from total pressure

Pressure of O2 = 749.8 torr - 19.83 torr = 730. torr

Pressure of water = 730 torr

Q. 2

We calculate moles

moles of CO2 = mass in g /molar mass = 3.7476 g / 44.01 g per mol

= 0.08508 mol CO2

Lets convert pressure in atm

Pressure in atm = 758 torr * 1 atm / 760 torr = 0.997 atm

We convert T in K

T in K = 0 deg c+ 273.15 = 273.15 K

We use ideal gas law

PV = nRT

R = PV/ nT

R = 0.997 atm * 1.898 L / ( 0.085085 mol * 273.15) = 0.08145 L atm per K per mol

this value is slighty less than its ideal consition

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