Pressure of dry butane gas

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I am working on a Chemistry lab write up and I have to determine the pressure of the dry butane gas.

My Data Table:
initial mass of lighter= 21.03g
volume of gas collected= 93.6 mL
temperature of the water= 23.2 degrees C
barometric pressure= 1.012 atm
final mass of lighter= 20.820

therefore the mass of butane collected in gas collection tube= .210g

I tried using the ratio 1/760 = x/769 ... to no avail.

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Solution Preview

The "dry pressure" is the pressure of the butane is the total pressure corrected for the vapor pressure of the water. The vapor pressure of the water is 23.7 torr at ...

Solution Summary

The solution determines the pressure of dry butane gas.

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