Q21P - Chemistry: Molecular Nature Of Matter And Change

Question

Calculate each of the following:

1. Mass fraction of Cl in calcium chlorate
2. Mass fraction of P in tetraphosphorous hexaoxide

Step-by-Step Solution

Answer

1. The mass fraction of Cl in calcium chlorate is 0.343
2. The mass fraction of P in tetraphosporous hexaoxide is 0.563

Step 1: Definition of Mass

A property that reflects the quantity of matter within a sample is defined as mass.

Step 2: Calculations of mass fraction of Cl in calcium chlorate

The molar mass of calcium chlorate is $\mathbf{=}\mathbf{206}\mathbf{.}\mathbf{98}\frac{\mathbf{g}}{\mathbf{mol}}$

Mass fraction of Cl $\mathbf{=}\frac{\mathbf{2}\mathbf{mol}\mathbf{ }\mathbf{C}\mathbf{\left(}{\displaystyle \frac{35.45g \mathrm{Cl}}{\mathrm{molCl}}}\mathbf{\right)}}{\mathbf{206}\mathbf{.}\mathbf{98}\mathbf{g}\mathbf{ }\mathbf{Ca}{\mathbf{\left(}{\mathbf{ClO}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{2}}}$

Mass fraction of Cl is $\mathbf{0}\mathbf{.}\mathbf{343}$

Step 2: Calculations of mass fraction of P in tetraphsophorous hexaoxide

The molar mass of tetraphosphorus hexaoxide is $\mathbf{219}\mathbf{.}\mathbf{88}\frac{\mathbf{g}}{\mathbf{mol}}$

Mass fraction of P $\mathbf{=}\frac{\mathbf{4}\mathbf{molP}\left({\displaystyle \frac{30.97 \mathrm{gP}}{\mathrm{molP}}}\right)}{\mathbf{219}\mathbf{.}\mathbf{88}\mathbf{ }{\mathbf{gP}}_{\mathbf{4}}{\mathbf{O}}_{\mathbf{6}}}$

Mass fraction of P is 0.563