1 gram of an element combines with 0.35 g of oxygen to form X₂O.What is the atomic mass of X?
a) 45
b) 23
c) 52
d) 77
e) 100
Correct answer: b) 23
As emphasized in class, this question is not about memorization — it’s about units.
You must start with grams and end with g/mol.
If the...
