Question

What is the maximum mass of zinc oxide that can be produced by the reaction of 42.900000000000006g of zinc sulfide and 44.187000000000005g of oxygen?

Answer 1

Mass = 0.00541 g

Step-by-step explanation:

We will convert the larger given values in to smaller by rounding these figures.

Given data:

Mass of zinc sulfide = 43 g

Mass of oxygen = 44.2 g

Mass of zinc oxide = ?

Solution:

Chemical equation:

2ZnS + 3O₂ → 2ZnO + 3SO₂

Number of moles of ZnS:

Number of moles = mass/ molar mass

Number of moles = 43 g/ 97.5 g/mol

Number of moles = 0.44 mol

Number of moles of Oxygen:

Number of moles = mass/ molar mass

Number of moles = 44.2 g/ 32 g/mol

Number of moles = 1.4 mol

Now we will compare the moles of oxygen and zinc sulfide with zinc oxide.

ZnS : ZnO

2 : 2

0.44 : 0.44

O₂ : ZnO

3 : 2

1.4 : 2/3×1.4 =0.93

The number of moles of zinc oxide produced by ZnS are less so it will limiting reactant.

Mass of zinc oxide:

Mass = number of moles / molar mass

Mass = 0.44 mol / 81.38 g/mol

Mass = 0.00541 g