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rileyeddins1010
05.01.2020 •
Chemistry
What is the percent composition by mass of nitrogen in the compound n2h4 (gram-formula mass = 32 g/mol)?
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Ответ:
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
Ответ:
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 composition of Nitrogen =?Percentage =
× 100
Percentage of nitrogen =
× 100
Percentage of nitrogen = 0.875 × 100
Percentage of nitrogen = 87.5%Therefore, the percentage composition of the nitrogen in N₂H₄ is 87.5%
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