quiz test (meet-1)

In a solution, the solvent is...

• the substance being dissolved.

• always a liquid.

• the substance present in the greatest amount.

• always water.

A solution may contain...

• only one solvent but many solutes.

• many solvents but only one solute.

• only one solvent and one solute.

• many solvents and many solutes.

Calculate the concentration in % (m/m) of a solution containing 20.0 g of NaCl dissolved in 250.0 g of H₂O!

• 6.76% (m/m)

• 7.41% (m/m)

• 8.00% (m/m)

• 8.25% (m/m)

The defining expression for the molarity concentration unit is...

• moles of solute/liters of solution.

• grams of solute/liters of solvent.

• moles of solute/liters of solvent.

• grams of solute/liters of solution.

A solution is made by dissolving 0.40 mole of NaCl in enough water to give a final volume of 250.0 mL. What is the molarity of the solution?

• 0.10 M

• 0.80 M

• 1.6 M

• 2.5 M

What is the molarity of a solution containing 17.0 grams of NH₃ in 1.20 liters of solution? (Mr NH3=17)

• 0.0833 M

• 0.833 M

• 1.42 M

• 14.2 M

What is the mass percent concentration of a saline solution prepared by dissolving 1.00 mol of NaCl in 1.00 L of water? Mr NaCl=58,5 and density of water= 1 g/mL

• 58,5

• 5,85

• 55.27

• 5.527

• no correct response

The concentration of a solution is expressed as the number of moles in which of the following volumes?

• 1 L

• 1 mL

• 1 dL

• 1 kL

How many moles of HCl are there in 10 mL of a solution with a concentration of 0.5 mol L-1?

• 5 mol

• 1 mol

• 0.05 mol

• 0.005 mol

25 mL is equivalent to how many litres (L)?

• 0.025

• 0.25

• 2.5

• 0.0025