What is the percent composition by mass of nitrogen in the compound n2h4 (gram-formula mass = 32 g/mol)?

Explanation:

1. Calculate the molar mass of N₂H₄

2N = 2 × 14 = 28

4H = 2 ×  1  =  4

           Tot. = 32

2. Calculate the mass percent of N

The percentage composition of the nitrogen in N₂H₄ is 87.5%

The percentage composition of an element in a compound can be obtained by using the following formula:

Percentage = × 100

With the above formula, we can obtain the percentage composition by mass of nitrogen in N₂H₄ as illustrated below:

Molar mass of N₂H₄ = 32 g/mol

Mass of N in N₂H₄ = 2N = 2 × 14 = 28 g/mol

Percentage = × 100

Percentage of nitrogen = × 100

Percentage of nitrogen = 0.875 × 100

Therefore, the percentage composition of the nitrogen in N₂H₄ is 87.5%

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