Question

An element initially weighed 3.555 g. When it was burned in oxygen an oxide compound was produced. The product mass was 4.666 g.

A.) What is the mass of oxygen in the product?

B.) What is the mass percent of oxygen in the product? Show all work ( including working formula,setup and unit).

Answer 1

A)
The additional mass is that of Oxygen
4.666 - 3.555
= 1.111 g
B)
The percentage mass of oxygen can be obtained by:
[(mass of Oxygen)/ (Total mass of product)] * 100
= (1.111 / 4.666) * 100
= 23.81%