Question

Thirty grams of potassium chloride crystals are added to 400 mL of water. What is the molarity of this potassium chloride solution?

A.
1.0 M
B.
13.3 M
C.
0.186 M
D.
0.075 M

Answer 1

A

Step-by-step explanation:

Answer 2

Molarity of potassium chloride is:

A. 1.0 M

Step-by-step 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.

`<strong>molarity(M)=(moles\ of\ solute)/(volume\ of\ solution(ml))* 1000</strong>`

`<strong>M=(n)/(V(ml))* 1000</strong>`

Here'n' is the number of moles. It can be calculated using formula:

`<strong>n=(given\ mass(w))/(molar\ mass</strong>)`

given mass=30 gm

Molar mass of KCl = mass of K+mass of Cl

= 39.098+34.45

= 74.55 g

`<strong>n=(30)/(74.55)</strong>`

n = 0.402 moles

`<strong>M=(n)/(V(ml))* 1000</strong>`

`<strong>M=(0.402)/(400)* 1000</strong>`

`M=\0.001* 1000`

M=1.00 M

So molarity of potassium chloride is 1.00 M