Sample Problem 5.7
Finding the Molar Mass of a Volatile Liquid
PROBLEM:
An organic chemist isolates from a petroleum sample a colorless liquid with the properties of cyclohexane (C6H12). She uses the Dumas method and obtains the following data to determine its molar mass:
PLAN:
SOLUTION:
Use unit conversions, mass of gas and density-M relationship.
Is the calculated molar mass consistent with the liquid being cyclohexane?
m = (78.416 - 77.834)g
= 0.582 g of gas
M =
=
x
M of C6H12 is 84.16 g/mol - the calculated value is within experimental error
d =
M =
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