Calculate the moles and the mass of solute in 250.0 mL of 6.00 M NaOH.

Question

Quizplus · Accepted Answer

To calculate the moles of solute, we use the formula:

moles = Molarity x Volume (in liters)

Converting the volume of the solution from mL to L:

250.0 mL = 0.250 L

Substituting the values given in the formula:

moles = 6.00 M x 0.250 L = 1.50 moles

To calculate the mass of solute, we use the formula:

mass = moles x molar mass

The molar mass of NaOH is:

Na: 22.99 g/mol
O: 15.99 g/mol
H: 1.01 g/mol

Adding these up: molar mass of NaOH = 22.99 + 15.99 + 1.01 = 40.00 g/mol

Substituting the values in the formula:

mass = 1.50 moles x 40.00 g/mol = 60.0 g

Therefore, the correct answer is B.

Calculate the Moles and the Mass of Solute in 250