Question #3e253

1 Answer
May 29, 2017

Answer:

55.5 mg will do it

Explanation:

In 111 grams of #CaCl_2# you have 40 grams of #Ca# due to the fact that Ca has a mass of 40 grams and Cl has a mass of 35.5 grams.

Therefore, you need to take #(20*111)/40# mg of #CaCl_2# to get 20 mg/L Ca in a liter of water. It is 55.5 mg.

Your answer is 55.5 mg.