9) Given the reaction: Zn + 2HCI – ZnCl2 + H2

What is the total mass of ZnCl2 produced when 195 grams of Zn reacts completely with 216 grams of HCI to produce 6 gram of H2?

Mass = 408.9 g

Explanation:

Given data:

Mass of ZnCl₂ produced = ?

Mass of Zn react = 195 g

Mass of HCl = 216 g

Mass of hydrogen produced = 6 g

Solution:

Chemical equation:

Zn + 2HCl        →      ZnCl₂ + H₂

Number of moles of Zn:

Number of moles = mass/molar mass

Number of moles = 195g/ 65.4 g/mol

Number of moles = 3 mol

Now we will compare the moles of ZnCl₂ with Zn because it completely react.                

                 Zn        :        ZnCl₂

                   1        :          1

                   3       :           3

Mass of ZnCl₂ produced:

Mass = number of moles × molar mass

Mass = 3 mol × 136.3 g/mol

Mass = 408.9 g