How to calculate the relative density of ammonia by hydrogen?

The relative density of a gas is the ratio of the mass of one gas relative to the mass of another gas. Ammonia (NH3) has a mass of 17 grams / mol and hydrogen H2 has a mass of 2 grams / mol. Thus, ammonia refers to hydrogen as 17/2. This means that the relative density of ammonia behind hydrogen will be 8.5.

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