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Determining the relative molecular mass of butane

Description

Gas from a pressurised cylinder is collected over water to measure the volume and the mass. The relative molecular mass is found by calculation.

Credits

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This resource has been provided by, or developed in partnership with, Nuffield Foundation
determining-the-relative-...



Apparatus Chemicals

Eye protection

Access to a fume cupboard (Note 1)

Measuring cylinder (1 dm3)

Stand and clamp (Note 2)

Trough (Note 3)

Delivery tube, flexible and gas-tight (Note 4)

Top-pan balance (Note 5)

Optional:

Thermometer to measure room temperature +/- 0.5 oC, with digital display if available

Access to an accurate measurement of atmospheric pressure.

Gases available in small pressurised cylinders, for example:

Butane in lighter refill cans, from a camping gas stove or a gas blow lamp

Propellant gas from aerosol cans (this could be turned into an investigation into which gas is being used as the propellant)

In rural areas the laboratory gas supply may be butane or propane.

Refer to Health & Safety and Technical notes section below for additional information.

 






Gas from a pressurised cylinder is collected over water to measure the volume and the mass. The relative molecular mass is found by calculation.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.