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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
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