Question

percentage composition of CL in PCL3

Answer 1

(35.5×3)/(35.5×3+31) ×100
=77.5%

Answer 2

Answer: 77.45%

Explanation:

percentage composition=$\frac{\text {mass of the element}}{\text {Total mass of the substance}}\times 100\%$

${\text {percentage composition of chlorine}}=\frac{\text {mass of chlorine}}{\text {Total mass of the} PCl_3}\times 100\%$

Mass of chlorine=$35.5\times 3=106.5g$

Mass of $PCl_3=106.5+31=137.5g$

percentage composition of chlorine =$\frac{106.5}{137.5}\times 100\%=77.45\%$