Answer to Question #62447 in General Chemistry for Lauren

Question

Although there are three isotopes each for oxygen and magnesium, you only need to sort the two listed.

Average atomic mass values
for planet X (amu)
Oxygen 16.09
Chlorine 36.97
Magnesium 25.31

Mg-24,Mg-25,O-16,O-18,Cl-37,Cl-35

Need to be sorted into: more abundant on Earth, More abundant on Plant X, approximately equal abundance on both plants