Gustavo
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# A compound contains 14.5 g of magnesium and 3.5 g of oxygen. What is the mass percent of oxygen in the compound

♥ Gather information we know: Total Mass: $14.5+3.5$ Solve: $=18g$ Gather more information and solve: Percent of Oxygen: $\frac{3.5}{18}$  $* 100$ Final answer: 19.44%