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Aufwind · Answer 1 · 2017-05-25T07:08:50+0000

1. 60% (There are 5 elements and 3 are oxygen; 3/5=60%)

2. 40% (There are 5 elements and 2 are iron; 2/5=40%)

3. 40% (There are 5 elements once you distribute the 2 and it becomes MgO2H2, 2 are oxygen, 2/5=40%)

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