Question

2.241 g sample of nickel combines with oxygen to produce 2.852 g of metal oxide.

Calculate the number of grams of xygen in the metal oxide.

Answer 1

2.852 x 1/16 =00.17825g

Answer 2

I don't think that will do it.
The Law of Conservation of mass says everything on the left must equal everything on the right.
2.241 + x = 2.852.
X = ?