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Describe two experimental methods that could be used to determine the molar mass of a substance....

Describe two experimental methods that could be used to determine the molar mass of a substance. It may be necessary to search for this information. Cite your sources.

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Answer #1

To determine the molar mass of a substance

i) if the substance is volatile Victor-meyer method is used.

In this method a known mass of substance is vporised and its volume is measured at STP.

As we know at STP any gas occupies 22.4L of volume per one mole of substance , relating mass and volume the molar mass is calculated.

ii) if the substance is non- volatile , we can use any of the colligative properties

like

depression in freezing point

elevation of boiling point

measuring the lowering of vapor pressure or

osmotic pressure of solution.

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