please help Molar Mass of Butane Pre mal s cyinder was released into the Calcula

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Molar Mass of Butane Pre mal s cyinder was released into the Calculate the mass or cm, that · 2 Calculate the temperature of the water (and thus Find the vapor pressure of water at this temperature (use Determine the partial pressure being exerted by the CHs in the container. the chart in the introduction) t thi Use the ideal gas law and your caleulated data above to calculate the number of moles of CH. that were in the container 5. 6. Use the data from parts 1. and 5. to calculate the experimental molar m Page 101 Lab #11: Mo

Explanation / Answer

(1)

Mass of gas released into the container = Change in mass of container = 246.776-246.622 = 0.154 g

(2)

Temp of water and gas = 220C = 273+22 = 295 K

(3)

Using the chart we see that vapor pressure of water at this temp = 19.8 torr = 0.026 atm

(4)

Pressure exerted by water + Pressure exerted by methane = 1.05 atm

So,

Pressure exerted by methane = 1.05-0.026 = 1.024 atm

(5)

Using ideal gas equation:

PV = nRT

Putting values:

1.024*0.228 = n*0.0821*295

Solving we get:

n = 0.00964 moles

(6)

Experimental molar mass = Mass/moles = 0.154/0.00964 = 15.975 g

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