2Mg(s) + O₂(g) →→→ 2MgO(s) A college chemistry student is performing this reaction in a lab, where magnesium is burned and

Question

2Mg(s) + O₂(g) →→→ 2MgO(s)
A college chemistry student is performing this reaction in a lab, where magnesium is
burned and combines with oxygen from the air to produce magnesium oxide.
The students burns 2.92 g of Mg, and there is excess oxygen from the air. They
incorrectly calculated that the mass of magnesium oxide produced was 2.42 g. Here is
their work:
2.92 g 1 mol
2 mol
X
X
24.3 g
1 mol
X
40.3 g = 2.42 g
-
1 mol
1) What did the student do wrong? There is an error in their work. Explain specifically
what part is incorrect. (2 pts)
2) What recommendation(s) would you give to the student regarding showing their
work? There is an improvement that can be made to help them avoid this mistake in the
future. (2 pts)
3) Instead of 2.42 g, what answer should the student have gotten? (2 pts)

Kunduz · Accepted Answer

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