Arrange the following gases in order of increasing average molecular speed at 25 degrees c: n2, he, o2, co2

Explanation:

It is known that relation between average molecular speed and and molar mass is as follows.

where, = average molecular speed of gas 1

              = average molecular speed of gas 2

            = molar mass of gas 1

            = molar mass of gas 2

This means that more is the molar mass of a gas lesser will be its average molecular speed.

Hence, molar mass of nitrogen () = 14 g/mol

Molar mass of helium (He) = 2 g/mol

Molar mass of oxygen () = 16 g/mol

Molar mass of carbon dioxide () = 44 g/mol

Thus, given gases are arranged in order of increasing average molecular speed at as follows.

        < < < He

The correct answer is

Explanation:

The relationship between the molecular weight of the compound and the speed of the compound is inverse.

Hence, the more the molecular weight, the less the molecular speed.

The molecular weight is as follows:-

carbon dioxide has 44, oxygen has 32, nitrogen has 28 and helium is 4.

Therefore, the correct sequence is

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