Answer to Question #221617 in General Chemistry for lavaniyah

Question

In an experiment regarding composition analysis, an unknown is first fully combusted and then the products are analyzed. Combustion of 1.38 g of the unknown sample which contains C, H, O and N yields 1.72 g of CO2 and 1.18 g of H2O. In a separate test, another sample of the unknown with a mass of 22.34 g is found to contain 6.75 g of O.

Calculate the mass of oxygen, O from the 1.38 g sample?

Answer 1

22.34=6.75

1.38=?

$O=\frac{1.38×6.75}{22.34}=0.42g$

O=0.42g