How much nitrogen is in 7.5 grams of ammonia?

Answer 1

First you need to find the atomic masses of each element involved in the compound NH3, and add them up to find the total molecular mass of ammonia.

Nitrogen = 14.0 grams

Hydrogen = 1.01 × 3 atoms = 3.03 grams

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Ammonia = 17.03 grams

Then you take the mass of nitrogen in one molecule and divide it by the total mass to find the percent composition.

14.0 grams Nitrogen ÷ 17.03 grams Ammonia = .822 = 82.2% nitrogen in ammonia

Then you simply need to take 82.2% of 7.5 grams to find how much nitrogen is in that particular amount.

82.2% × 7.50 = 6.17 grams of nitrogen in 7.50 grams of ammonia

Answer 2

7.5 grams of ammonia contains approximately 4.5 grams of nitrogen. This is calculated by multiplying the molar mass of nitrogen (14 g/mol) by the number of moles of nitrogen in ammonia (1 mole) and then converting to grams.