# colligative properties

a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME

WATER PURE PRESSURE (P0) IS 23.8 TORR

VAPOR PRESSURE IS 19.6 TORR
DONT KNOW HOW TO SOLVE IT ?

P(SOLUTION)= X (CH4N2O) WATER (PURE PRESSUR

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3. 5

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posted by DrBob222
2. i still don't get it sir

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posted by yeng
3. What exactly do you not understand.
XH2O = 19.6/23.8 = 0.824
Then 0.824 + XCH4N2O = 1
XCH4N2O = 1-0.823 = ?
You may be confused by where did I get the one. The sum of the mole fractions in EVERY solution must add up to 1.
Remember 100% is all of something and that is 1 when converted to a fraction so all fractions in a solution must add to 1.

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posted by DrBob222

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