# chemistry

A gas 'x' is collected over water at 17 degree celcius and 750 mm pressure.If the volume of the gas collected is 50 cc then calculate the volume of the dry gas at standard temperature pressure and at 17 degree celcius the vapour of pressure is 14 mm

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1. Note the correct spelling of celsius.
Total pressure 750 mm Hg.
750 = Pdry gas + PH2O vapor
750 = Pdry gas + 14
P dry gass = ??
Now convert to STP using (P1V1/T1) = (P2V2/T2)
My quickie estimate is about 45 cc but that is an exact answer.

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2. 45.58 cc

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3. p1=total press.- p2=760mm
vapor press. v2=?
=(750-14)mm t2=273k
=736mm
v1=50cc
t1=(17+273)k
=290k
USE FORMULA- p1v1/t1=p2v2/t2

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4. Bro

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5. p1 = total pressure - vapour pressure
= 750-14 mm pressure
= 736 mm pressure

v1 = 50cc
t1 = 290K

p2 = 760 mm pressure
t2 = 273K
v2 = ??

Using P1*V1/T1 = P2*V2/T2, we get
V2 = 45.58cc (approx)

Hope that helps!

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