During heating a 5 g solid gives off oxygen gas. The mass of the residue after heating is 3.5 g. What is the mass of the oxygeb ? What percent of the compoiund is oxygen?

Answer 1

A ==> C
A start is 5.0 g
A finish is 3.5
mass oxygen must be 5.0-3.5 = ??
%oxygen = (mass oxygen/mass compound)*100 =??

Answer 2

1.5g