Question

What is the percent by mass of oxygen in magnesium oxide, MgO
(a) 20%
(b) 40%
(c) 50%
(d) 60%​

Answer 1

Answer:

b

Explanation:

Mass of magnesium = 24

Mass of oxygen = 16

% of Oxygen = (16/40) ×100 = 40 %

Answer 2

Explanation:

hey mates your answer is here:

40% is answer