18-09-2022
Chemistry

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Helium is a gas used to fill balloons. It is present in the air in very small quantities. Diffusion can
be used to separate it from the air.
Air at 1000 °C is on one side of a porous barrier. The air which passes through the barrier has
a larger amount of helium in it.
(i) Why does the air on the other side of the barrier contain more helium?
ii) Why is it an advantage to have the air at a high temperature?

Helium is a gas used to fill balloons It is present in the air in very small quantities Diffusion can be used to separate it from the air Air at 1000 C is on on class=

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