Explanation:
Molarity is defined as the ratio of number of moles of solute per litre of solution.
Let molarity be [tex]M[/tex].
Given mass of [tex]KNO_{3}[/tex][tex]=74.5g[/tex]
Weight of [tex]K[/tex] is [tex]39g[/tex]
Weight of [tex]N[/tex] is [tex]14g[/tex]
Weight of [tex]O[/tex] is [tex]16g[/tex]
Molar mass of [tex]KNO_{3}=39+14+3(16)=101g[/tex]
Let [tex]n[/tex] be the number of moles of solute.
[tex]n=\frac{given mass}{molar mass}=\frac{74.5}{101}=0.73[/tex]
Let [tex]v[/tex] be the volume of solution.
Given,[tex]v=700mL=0.7L[/tex]
[tex]M=\frac{n}{v}[/tex][tex]=\frac{0.73}{0.7}=1.04M[/tex]
