Question

What is the percent composition of a compound formed when 6.85 g of magnesium combines with 20.0 g of chlorine to form magnesium chloride?

Answer 1

Mass of Magnesium Chloride = 26.85 grams

Percentage of Magnesium= 25.5 %

Percentage of Chlorine =74.5 %

Step-by-step explanation:

Mass of Magnesium Chloride= Mass of magnesium + Mass of Chlorine 6.85 grams + 20.0 grams = 26.85 grams

Percentage of Magnesium = 6.85 grams/26.85 grams x 100% = 25.5%

Hence, Magnesium = 25.5 %

Percentage of Chlorine = (20.0 grams/26.85 grams) x 100 % = 74.5%

Hence, Chlorine = 74.5 %

So, the compound is 25.5 % magnesium and 74.5 % Chlorine by mass.