Question

A gas has a vapour density of 2with respect to oxygen. It's molar mass is _(a) 4g/mol (b)16g/mol (c) 32g/mol (d) 64g/ mol​

Answer 1

Answer:

4g/mol

Explanation:

Molar mass = vapour density × 2

Answer 2

Concept:

• The density of vapour with respect to that of hydrogen is known as its vapour density.
• It can be expressed as the mass of a substance in a certain volume divided by the mass of hydrogen in the same volume.
• Half the molar mass of a gas is its vapour density.

Given:

• The gas has a vapour density of 2 with respect to oxygen.

Find:

• The molar mass of the given gas

Solution:

Vapour density of gas = molar mass of gas/2

the molar mass of gas = 2* VD

VD of oxygen = molar mass of oxygen/2

VD of oxygen = 32/2 = 16

VD of gas/VD of oxygen = 2

VD of gas = 2* VD of oxygen

VD of gas = 2* 16 = 32

molar mass of gas = 2* VD

molar mass of gas = 2* 32 = 64

The molar mass is 64 g/mol.

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