How many grams of ZnCl2 will be produced from 26.0g of Zn and 42.0g of HCl. Round to three significant figures

The mass of zinc chloride that can be produced is 54.1 grams

Explanation:

To calculate the number of moles, we use the equation:

    .....(1)

Given mass of zinc = 26.0 g

Molar mass of zinc = 65.4 g/mol

Putting values in equation 1, we get:

Given mass of HCl gas = 42 g

Molar mass of HCl gas = 36.5 g/mol

Putting values in equation 1, we get:

The chemical equation for the reaction of zinc and chlorine gas follows:

By Stoichiometry of the reaction:

1 mole of zinc reacts with 2 moles of HCl

So, 0.397 moles of zinc will react with = of HCl

As, given amount of HCl is more than the required amount. So, it is considered as an excess reagent.

Thus, zinc is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of zinc produces 1 mole of zinc chloride

So, 0.397 moles of zinc will produce = of zinc chloride

Now, calculating the mass of zinc chloride from equation 1, we get:

Molar mass of zinc chloride = 136.3 g/mol

Moles of zinc chloride = 0.397 moles

Putting values in equation 1, we get:

Hence, the mass of zinc chloride that can be produced is 54.1 grams