# What Weight of Oxygen Gas Will Contain the Same Number of Molecules as 56 G of Nitrogen Gas ? (O = 16 U ; N = 14 U) - Science

What weight of oxygen gas will contain the same number of molecules as 56 g of nitrogen gas ?

(O = 16 u ; N = 14 u)

#### Solution

Mass of nitrogen gas = 56g

We know that equal moles of all substances contain equal number of molecules. (1 mole of all substances contains 6.022 × 1023 molecules).

The first step will be to convert 56g  nitrogen gas into moles.

1 mole  nitrogen gas N2 = 28g

28g  nitrogen = 1 mole

56g  nitrogen = 2 moles

Since, equal moles of all substances contain equal number of molecules, 2 moles of nitrogen will have the same number of molecules as 2 moles of oxygen.

The next step will be to find the mass of 2 moles of oxygen in grams.

1 mole of oxygen = 32g

2 moles of oxygen = 32 × 2 = 64g

Hence, 64g  oxygen will contain the same number of molecules as 56g  nitrogen gas.

Concept: Atoms and Molecules Numericals
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#### APPEARS IN

Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 3 Atoms and Molecules
Hots Questions | Q 46 | Page 174