Question

How many grams of NaCl are contained in 0.50 L of a 4.20 M solution?

58.44 g NaCl

245.5 g NaCl

122.7 g NaCl

173.6 g NaCl

Answer 1

The answer to your question is the third option: 122.7 g of NaCl

Step-by-step explanation:

Data

mass of NaCl = ?

molecular mass of NaCl = 23 + 35.5 = 58.5

volume = 0.50 l

concentration = 4.20 M

Formula

`Molarity = (moles)/(volume)`

Moles = Molarity x volume

Process

1.- Substitute the data given to find the moles of NaCl

Moles = 4.20 x 0.5

Moles = 2.1

2.- Calculate the grams of NaCl using proportions

58.5 g of NaCl ----------------- 1 mol

x ---------------- 2.1 moles

x = (2.1 x 58.5) / 1

3.- Result

x = 122.7 g of NaCl