The percent composition by mass of magnesium mgbr2 (gram formula mass= 184 grams/mole) is equal

a- 24/184 x 100
b- 160/184 x 100
c- 184/24 x 100
d- 184/160 x 100

i really need an answer for this !

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.

How do scientists think that gravity affected the formation of our solar system?

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8