Gases questions | form five Chemistry

Use the kinetic gas equation to explain the following concepts

1. The pressure exerted by an ideal gas increases when it is heated at a constant volume.
2. The volume occupied by an ideal gas increases when it is heated at constant pressure.

Answer / Solution

UNSOLVED

A flammable gas made up of only carbon and hydrogen is generated by certain anaerobic bacteria in sewage drains. A pure sample of a gas was found to effuse through a certain porous barriers in 1.50 minutes. Under the same conditions of temperature and pressure it takes 4.73 minutes for an equal volume of bromine gas to effuse through the same barrier . Calculate the molar mass of the unknown gas and suggest the name of the gas. (Molecular mass of Bromine is 159.8 g/m)

Answer / Solution

UNSOLVED

In the determination of the molecular weight of chloroform  vapour by Hofmann`s method , the following results were obtained :

Weight of liquid in bulb =0.2704 g, Volume of vapour =110 cm³ ; Temperature of vapour =99.6 °C; Atmospheric pressure =747 mmHg; Vapour pressure of water vapour at 99.6°C =285.2 mmHg. Calculate the the relative molecular weight of chloroform if 1 dm³ of H₂ at S.T.P weighs 0.09 g. In your calculations, show your work clearly including manipulations of units.

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UNSOLVED

A 0.25 moles of air has entered a diesel engine at a pressure of 1.05x10⁵ Pa and a temperature of 27^oC. Assuming that air is ideal, calculate:

1. The volume it occupies.
2. Its temperature, immediately after compression to one twentieth of its original volume where the pressure rises to 7.0x10⁶Pa.

Answer / Solution

UNSOLVED

A 42g of nitrogen gas and 8g of hydrogen gas are mixed in a 10 litre vessel at 20^oC. Calculate the partial pressure of each gas and the total pressure of the gas mixture.

Answer / Solution

UNSOLVED