A 25.0-gram of magnesium oxide contains 10.8 grams of magnesium. What is the percent of oxygen by mass in this compound?
a. 89.2%
b. 14.2%
c. 43.2%
d. 56.8%
Answer: D
A 25.0-gram of magnesium oxide contains 10.8 grams of magnesium. What is the percent of oxygen by mass in this compound?
a. 89.2%
b. 14.2%
c. 43.2%
d. 56.8%
Answer: D