Question

The molecular mass of calcium oxide is

$(AtomicmassofCa=40u,O=16u)$

• A.
  40 u
• B.
  106 u
• C.
  56 u
• D.
  20 u

Answer 1

The correct option is C

56 u
$\text{Molecular mass of calcium oxide (CaO)}=(1\times \text{Atomic mass of Ca})+(1\times \text{Atomic mass of O)}=(1\times 40)+(1\times 16)=40+16=56u$

Hence, the correct answer is option (c).