Molality And Molarity (Concentration of Solutions Part 3)

Molality (m) = moles of solute / _________________________.

• a. kilogram of solvent

• b. kiloliter of solvent

• c. kilometer of solvent

• d.ounces of solvent

Molar mass of NaOH is ______________________

Correct

• a. 40 grams/mol

• b. 50 grams/mol

• c. 45 grams/mol

• d. 38 grams/mol

What is the molality of a solution made by dissolving 2 moles of NaOH in 400 grams of water?

• a. 5 mol/kg. solvent

• b. 4 mol/kg solvent

• c. 3 mol/kg. solvent

• d. 2.5 moles /kg solvent

Molality is defined as ________________________

• a. the moles of solute per kilogram of solvent

• b. moles of solute per liter of solution

• c. mass of solute/ mass of solution

• d. mass of solute/ mass of solvent X 100

Molarity is measured in _____.

Incorrect

• a. moles per g.

• b. mols per L.

• c. moles per mm.

• d. moles per mL.

How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?

• a. 1074 mol

• b. 0.069 mol

• c. 1.07 mol

• d. 62.7 mol.

What do molarity and molality have in common?

• a. Both have "kg solvent" in the denominator

• b. Both have "moles solute" in the numerator

• c. Both have "L solution" in the denominator

• d. Both have "moles solution" in the denominator

Which equation is used to find molarity?

• a. Moles solute/L solution

  
  

• b. Moles solute/kg solution

• c. Moles solute/kg solvent

• d. Grams solute/L solution

Which equation is used to find molality?

• a. Moles solute/L solution

• b. Moles solute/kg solution

• c. Moles solute/kg solvent

• d. Grams solute/L solution.

What is a solvent?

• a. The substance that does the dissolving in a solution.

• b. The mixing of different substances.

• c. The process in which neutral molecules lose or gain electrons.

• d. The process in which neutral molecules lose or gain electrons.