The Dumas method is a procedure for determining the molar mass of a gas. In this procedure, the mass of a gas is divided by the moles of gas determined from the ideal gas equation (n = PV/RT ). The molar masses of some compounds, such as acetic acid, illustrated above, show significant deviations from the “correct” values. Why does the presence of dimers as illustrated make it unlikely to obtain an accurate molar mass of acids, such as acetic acid?
A.
Acetic acid, like all acids, will lose a hydrogen ion, so the molar mass is that of the acetate ion, which is less than that of acetic acid.
B.
Acetic acid is a liquid at room temperature, and its boiling point is too high to get accurate results.
C.
Acids are too reactive to give accurate results.
D.
The presence of strong intermolecular forces (hydrogen bonding) makes the gas nonideal; therefore the ideal gas law is not applicable.
Exam No：AP Chemistry Problem Set 8 Year：2024 Question No：APChemistry2024AP0247
Answer:
D
Knowledge points:
3.7 Solutions and Mixtures
Solution:
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