9) What is the percent composition by mass of 64g oxygen in the compound MgSO4 (gram-
formula mass = 120. grams per mole)?
A)
20%
B)
27%
C)
46%
D)
53%

Answer asap need by wednesday morning calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 best answer will be brainliest

Helium decays to form lithium. which equation correctly describes this decay?

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.