Question

a compound is M(OH)2. Given that the Mr of the compound is 98, calculate the Ar of M.

Answer 1

for ionic compounds e.g. NaCl = 23 + 35.5 58.5) or molecular mass for covalent elements or compounds ...

e.g. Mr of N2 = 28 from (2 x 14) or compounds e.g. Mr of C6H12O6 = 180 from [(6 x 12) + (12 x 1) + (6 x 16)],