Question

Azlan has been given a 250.00 mL volumetric flask and asked to use it to makean aqueous solution of sodium chloride, NaCl, with a concentration of 0.10mol L-1 for a corrosion experiment. The sodium chloride, NaCl, is available as white
crystals. Determine the mass in grams of sodium chloride that Azlan will needtoweigh out. (Molar mass of NaCI = 161.90494 g/mol)

Answer 1

Answer:

1.5 g

Explanation:

Step 1: Given data

• Volume of solution (V): 250.00 mL = 0.25000 L

• NaCl molar concentration (C): 0.10 mol/L

• Molar mass of NaCI (M): 58.44 g/mol

Step 2: Calculate the required moles (n) of NaCl

We will use the following expression.

n = C × V

n = 0.10 mol/L × 0.25000 L

n = 0.025 mol

Step 3: Calculate the mass (m) corresponding to 0.025 moles of NaCl

We will use the following expression.

m = n × M

m = 0.025 mol ×58.44 g/mol

m = 1.5 g