Question

magnesium + oxygen → magnesium oxide reaction, how much magnesium is needed to react with 1.2 grams of oxygen to produce 22.6 grams of magnesium oxide?
a 20.5 g/mol
b 22.84 g/mol
c 3.887 g/mol
d 4.1 g/mol

Explanation:

Step1: Write the chemical reaction

The reaction between magnesium ($Mg$) and oxygen ($O_2$) to form magnesium oxide ($MgO$) is \(2Mg + O_2
ightarrow2MgO\).

Step2: Calculate the mass of magnesium oxide formed

According to the law of conservation of mass, mass of reactants = mass of products. Let the mass of magnesium be \(x\) grams. Then \(x + 12=27.6\).

Step3: Solve for \(x\)

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Answer:

C. \(15.6\space g/mol\)