Answer:
Molarity of potassium chloride is:
A. 1.0 M
Explanation:
Molarity is used to express the concentration of the solution.It is defined as the moles of solutes per liter volume of solution.It is denoted by M.
[tex]molarity(M)=\frac{moles\ of\ solute}{volume\ of\ solution(ml)}\times 1000[/tex]
[tex]M=\frac{n}{V(ml)}\times 1000[/tex]
Here'n' is the number of moles. It can be calculated using formula:
[tex]n=\frac{given\ mass(w)}{molar\ mass}[/tex]
given mass=30 gm
Molar mass of KCl = mass of K+mass of Cl
= 39.098+34.45
= 74.55 g
[tex]n=\frac{30}{74.55}[/tex]
n = 0.402 moles
[tex]M=\frac{n}{V(ml)}\times 1000[/tex]
[tex]M=\frac{0.402}{400}\times 1000[/tex]
[tex]M=\0.001\times 1000[/tex]
M=1.00 M
So molarity of potassium chloride is 1.00 M
