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magnesium oxide, mgo, is 60.3% magnesium. how much magnesium is contained in a 25.5 g sample of magnesium oxide?
6.03g
4.25g
10.1g
15.4g

Explanation:

Step1: Identify the percentage - mass formula

Mass of element = Percentage of element×Mass of compound

Step2: Substitute the given values

The percentage of magnesium is 60.3% or 0.603 in decimal form, and the mass of magnesium oxide is 25.5 g. So, mass of magnesium = 0.603×25.5 g

Step3: Calculate the result

0.603×25.5 = 15.3765 g≈15.4 g

Answer:

D. 15.4 g