Respuesta :
Given the total mass of the compound, we can determine directly the amount of oxygen from the determined masses of other elements, carbon, hydrogen, and nitrogen. The mass of oxygen is 115 g- (13.2+68.3+15.9)g which is 17.6 g oxygen. To get the mass percent, divide 17.6g by 115 g and multiply by 100%. This is equal to 15.30%.
Answer: The mass percentage of oxygen in the given compound is 15.30 %.
Explanation:
We are given:
Mass of carbon in given compound = 68.3 g
Mass of Nitrogen in given compound = 15.9 g
Mass of Hydrogen in given compound = 13.2 g
Mass of the given compound = 115 g
Mass of Oxygen in compound = [tex]115-(68.3+15.9+13.2)=17.6g[/tex]
To calculate the mass percent of an element in a compound, we use the equation:
[tex]\text{Mass percent of oxygen}=\frac{\text{Mass of oxygen in compound}}{\text{Mass of the compound}}\times 100[/tex]
Putting values in above equation, we get:
[tex]\text{Mass percent of oxygen}=\frac{17.6g}{115g}\times 100=15.30\%[/tex]
Hence, the mass percentage of oxygen in the given compound is 15.30 %.
