What is the relative formula mass of $$\(\mathrm{Mg}(\mathrm{OH})_{2}\)$$ ?
A.
21
B.
30
C.
42
D.
58
Exam No：0620_w18_qp_12 Year：2018 Question No：8
Answer:
D
Knowledge points:
3.2.1. Describe relative atomic mass, Ar, as the average mass of the isotopes of an element compared to 1/12th of the mass
3.2.2. Define relative molecular mass
3.2.3. Calculate reacting masses in simple proportions. Calculations will not involve the mole concept
Solution:
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