4. 90 g of zinc are placed in hydrochloric acid (HCI). How many grams of zinc chloride are
produced?

188.31g of ZnCl2

Explanation:

First, we need to write a balanced equation for the reaction between Zn and HCl. This is shown below:

Zn + 2HCl —> ZnCl2 + H2

Molar Mass of Zn = 65g/mol

Molar Mass of ZnCl2 = 65 + (2x35.5) = 65 + 71 = 136g/mol

From the equation,

65g of Zn produced 136g of ZnCl2.

Therefore, 90g of Zn will produce = (90 x 136)/65 = 188.31g of ZnCl2