Question

Verona dissolves 20. grams of NaCl with water to make a 100 ml solution. What is the molarity of the solution? There are 1,000 mL in 1 L O a. 3.4 M O b.0.34 M O G.58 M O d. 20. M

Answer 1

b.0.34 M

Step-by-step explanation:

Given that:

Mass of NaCl = 20 grams

Molar mass of NaCl = 58.44 g/mol

The formula for the calculation of moles is shown below:

`moles = (Mass\ taken)/(Molar\ mass)`

Thus,

`Moles= (20\ g)/(58.44\ g/mol)`

`Moles= 0.3422\ mol`

Given that volume = 100 mL

Also,

`1\ mL=10^(-3)\ L`

So, Volume = 100 / 1000 L = 0.1 L

Considering:

`Molarity=(Moles\ of\ solute)/(Volume\ of\ the\ solution)`

`Molarity=(0.3422)/(0.1)`

Molarity = 0.34 M