Question

Suppose you need to prepare 120.8 mL of a 0.249 M aqueous solution of NaCl. What mass, in grams, of NaCl do you need to use to make the solution?

Answer 1

The mass, in grams, of NaCl needed to use to make the solution is 1.76grams.

HOW TO CALCULATE MASS?

The mass of a substance can be calculated by multiplying the number of moles by its molar mass.

However, the number of moles must first be calculated by using the following expression:

Molarity = no. of moles ÷ volume

no. of moles = 0.249 × 0.1208

no. of moles = 0.03moles

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

mass of NaCl = 0.03 × 58.5 = 1.76g

Therefore, the mass, in grams, of NaCl needed to use to make the solution is 1.76grams.

Learn more about mass at: brainly.com/question/19694949