Question

A piece of magnesium ribbon reacts with oxygen to form magnesium oxide, mgo. what is the percent composition of the compound? question 1 options: 50% mg; 50% o 66% mg; 34% o 60% mg; 40% o 24% mg; 16% o

Answer 1

The Percent composition of  MgO is 60.304 % and 39.696 % respectively.

What percentage of the given chemical is there?

Mg + 1/2O₂ -------> MgO

We now want to know the percent composition of MgO in light of this reaction. Since the original reactants' and the product's mass are not provided, we can use the component's atomic weights to solve this problem.

Let's compute the molar mass of MgO since Mg has a molecular weight of 24.305 g/mol and O has a molecular weight of 15.999 g/mol:

molar mass of $MgO= 24.305 + 15.999 = 40.304 \frac{g}{mol}$

Now with this weight, let's see the percent composition of this compound:

Mg percentage  =$\frac{24.305}{40.304 * 100} = 60.304$%

O percentage = $\frac{15.999}{40.304 * 100} = 39.696$ %

The Percent composition of  MgO is 60.304 % and 39.696 % respectively.

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