Question

Formula unit mass of $MgC{l}_2$ is

• A.
  47.5 u
• B.
  190 u
• C.
  95 u
• D.
  58 u

Answer 1

The correct option is C

95 u
Atomic mass of Mg = 24 u

Atomic mass of Cl = 35.5 u

Formula unit mass of $MgC{l}_2=(1\times \text{Atomic mass of Mg)}+(2\times \text{Atomic mass of Cl)}=(1\times 24)+(2\times 35.5)=24+71=95u$

Hence, the correct answer is option (c).