Question

Calculate the molar concentration if 0.95 g of sodium sulfate was dissolved in 120 mL of solution.

Answer 1

To find the molar concentration, divide the mass of sodium sulfate by its molar mass to find the number of moles, convert volume to liters, then divide moles by the volume. For 0.95 g of Na2SO4 in 120 mL, the molar concentration is approximately 0.0668 M.

Step-by-step explanation:

To calculate the molar concentration of a solution, we need to follow these steps:

1. Calculate the number of moles of sodium sulfate (Na2SO4) by dividing the mass of the compound by its molar mass. The molar mass of Na2SO4 is 142.04 g/mol.
2. Convert the volume of the solution from milliliters (mL) to liters (L) by dividing by 1000.
3. Divide the number of moles by the volume in liters to get the molarity.

Step 1: Number of moles = Mass (g) / Molar Mass (g/mol)

= 0.95 g / 142.04 g/mol

Step 2: Volume in liters = 120 mL / 1000

= 0.12 L

Step 3: Molar Concentration (M) = Number of moles / Volume (L)

Plugging the values into the formula, we get:

Molar Concentration = (0.95 g / 142.04 g/mol) / 0.12 L

After performing the calculations:

Molar Concentration \u2248 = 0.0668 M