Magnesium oxide can be made by heating magnesium metal in the presence of the ox

ID: 483480 • Letter: M

Question

Magnesium oxide can be made by heating magnesium metal in the presence of the oxygen. The balanced equation for the reaction is

2Mg(s)+O2(g)2MgO(s)

When 10.2 g Mg is allowed to react with 10.6 g O2, 11.8 g MgO is collected.

Part A

Determine the limiting reactant for the reaction.

Part B

Determine the theoretical yield for the reaction.

Express your answer in grams.

m=____________________g

Part C

Determine the percent yield for the reaction.

Express your answer as a percent.

_______________________%

A) Mg(s) B) O2(g)

A) accxording to balanced reaction

2 x 24.3 g Mg reacts with 32 g O2

10.2 g Mg reacts with 10.2 x 32 / 2 x 24.3 = 326.4 / 48.6 = 6.72 g O2

but we have 10.6 g O2 sp O2 is exess reagent and Mg is limiting reagent.

limiting reagent = Mg

b) 2 x24.3 g Mg gives 2 x 40.30 g MgO

10.2 g Mg gives 10.2 x 2 x 40.3 / 2 x 24.3 = 16.92 g MgO

therotical yield of MgO = 16.92 g

C) % yield = [11.8 / 16.92] x 100

% yield = 69.74

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