Question

Calculate the percentage yield of the reaction?

Magnesium reacts with oxygen as shown in the equation below:

`2Mg+O_2 ->2MgO`

Calculate the percentage yield of the reaction, given that burning 2.32g of magnesium produced 2.39g of magnesium oxide. (4 marks)

Answer 1

61.9%

Explanation:

1 mole of Mg give 1 mole of MgO
or 24 g of Mg gives 40 g of Mgo

Thus, 2.32 g of Mg will give `40/24*2.32` = 3.86 g
3.86 is given by sample with 100% yield i.e. expected

But actually we obtained( 2.39 g

Percent yield= (Obtained)/ (Expected ) * 100

=`(2.39)/(3.86)*100=61.9%`