Question

use the references to access important value. calculate the percentage composition for n₂o₄. mass percentage of nitrogen = % mass percentage of oxygen = %

Explanation:

Step1: Determine atomic masses

Atomic mass of N = 14 g/mol, atomic mass of O = 16 g/mol.

Step2: Calculate molar - mass of N₂O₄

Molar - mass of N₂O₄ ($M$) = 2×14 + 4×16 = 28+64 = 92 g/mol.

Step3: Calculate mass percentage of nitrogen

Mass percentage of N = $\frac{2\times14}{92}\times100\%=\frac{28}{92}\times100\%\approx30.43\%$.

Step4: Calculate mass percentage of oxygen

Mass percentage of O = $\frac{4\times16}{92}\times100\%=\frac{64}{92}\times100\%\approx69.57\%$.

Answer:

Mass percentage of nitrogen = 30.43%
Mass percentage of oxygen = 69.57%