Question

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

Explanation:

Step1: Identify the percentage - mass formula

The mass of magnesium in the sample can be found using the formula: Mass of magnesium = Percentage of magnesium×Mass of magnesium oxide sample.

Step2: Convert percentage to decimal

60.3% = 0.603.

Step3: Calculate the mass of magnesium

Mass of magnesium = 0.603×25.5 g.
\[0.603\times25.5 = 15.3765\approx15.4\] g

Answer:

15.4 g