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The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1: 4. The ratio of number of their molecule is -

1. 7: 32
2. 1: 8
3. 3: 16
4. 1: 4

Correct answer: 7: 32

Solution

To find the ratio of the number of molecules, we first need to convert the mass ratio into a mole ratio using the molar masses of oxygen (16 g/mol) and nitrogen (28 g/mol). Given the mass ratio of oxygen to nitrogen is 1:4, we can calculate the number of moles of each gas and find that the ratio of their molecules is 7:32.

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