Relative Atomic Mass, A, - Easy Peasy
This is just a way of saying how heavy different atoms are compared with the mass of an atom of Carbon - 12. So carbon-12 has R,A,M, of exactly 12.
42He: The Mass number is the relative atomic mass, so Helium has an A of 4
126C: So Carbon has an A of 12
Relative Formula Mass, M, - Also Easy Peasy
Mg + Cl2 = MgCl2
24 + (35.5 x 2) = 95
Question: Find the relative Formula mass for the alcohol C2H4(OH)2
A, for C = 12 A, for H = 1 A, for O = 16
C2 + H4 + (OH)2 = C2H4(OH)2
(12 x 2) + (1 x 4) + [(16 + 1) x 2] = 62
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