DETERMINING MOLAR MASS OF VOLATILE LIQUIDS USING IDEAL GAS LAW IN CHEMISTRY LAB. EXAM QUESTIONS AND ANSWERS. VERIFIED 2026/2027.

DETERMINING MOLAR MASS OF
VOLATILE LIQUIDS USING IDEAL GAS
LAW IN CHEMISTRY LAB. EXAM
QUESTIONS AND ANSWERS. VERIFIED
2026/2027.




What is the purpose of Experiment 9? - ANS To determine the molar mass of a volatile, non-
polar liquid by converting it to a gas and using the Ideal Gas Law.


What is the key equation used in the lab? - ANS PV = nRT


What is the modified equation used in this lab? - ANS PV = (g/M)RT


How is the equation solved for molar mass? - ANS M = (gRT) / (PV)


Why can the Ideal Gas Law be used in this lab? - ANS Because the substance is volatile and
non-polar, so it behaves close to an ideal gas.


Why are highly polar substances not used? - ANS Highly polar gases do not behave ideally
due to strong intermolecular forces.


What does 'volatile' mean? - ANS A substance that evaporates easily at relatively low
temperatures.

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