Question

A 143.1 g sample of a compound contains 53.4 g of carbon, 16.9 g of hydrogen, 43 g of nitrogen, and some amount of oxygen. what is the mass percent of oxygen in the compound? 11.20% 11.81% 20.82% 30.05% 37.34%

Answer 1

I'm fairly sure this is it 20.82%

Answer 2

Answer:

20.82% is the mass percent of oxygen in the compound.

Explanation:

Total mass of the compound = 143.1 g

Mass of carbon = 53.4 g

Mass of hydrogen = 16.9 g

Mass of nitrogen= 43 g

Mass of oxygen= x

143.1 g = x + 53.4 g + 16.9 g + 43 g

x = 143.1 g - 53.4 g - 16.9 g - 43 g = 29.8 g

Percentage of oxygen in the compound:

$\%=\frac{\text{Mass of oxygen}}{\text{Mass of compound}}\times 100$

$\%=\frac{29.8 g}{143.1 g}\times 100=20.82\%$

20.82% is the mass percent of oxygen in the compound.