10. When a 13.6 g sample of a compound containing only magnesium and oxygen is decomposed, 5.4 g of oxygen is obtained. What is the percent of
magnesium in this sample?
• 5.4 g / 13.6 g * 100
• (13.6 g - 5.4g) / 13.6 g x 100
• (13.6 g - 5.4g) x 100
• 5.4g / (13.6 g-5.4g) x 100
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