Question

The percentage of carbon in a molecule of carbon monoxide is

• A.
  $42.85\%$
• B.
  $22.43\%$
• C.
  $40.32\%$
• D.
  $33.61\%$

Answer 1

The correct option is A

$42.85\%$
Molecular mass of carbon monoxide = 28 u

Mass of 1 atom of carbon = 12 u

Percentage of carbon in one molecule of CO

$=\frac{\text{Mass of carbon in one molecule of CO}}{\text{Mass of one molecul of CO}}\times 100=\frac{12}{28}\times 100=42.85\%$


Hence, the correct answer is option (a).