quiz 7 (sec. 1)

What is the concentration percentage of a solution of sucrose C₁₂H₂₂O₁₁ whose one liter contains one mole of the solute? [C= 12, H=1, O=16]

• 6.84%

• 10%

• 34.2%

• 100%

Which of the following solutions contains higher number of moles of the solute?

• 10 mL of 0.5 mol/L NaCl solution.

• 20 mL of 0.4 mol/L NaCl solution.

• 30 mL of 0.3 mol/L. NaCI solution.

• 40 mL of 0.2 mol/L NaCl solution.

The mass of sodium carbonate which is required to prepare 500 mL of 0.5 M solution equals ............... [Na=23, C=12, O=16]

• 10000 g

• 106 g

• 40 g

• 26.5 g

The concentration percentage of a molar solution of sulphuric acid H₂SO₄ equals ....... [H=1, S=32, O=16]

• 0.098%

• 0.98%

• 9.8%

• 98%

What is the concentration of sulphuric acid which 25 mL of it react completely with 36.2 mL of 0.225 M sodium hydroxide solution?

• $\frac{36.2\times0.225}{25}M$

• $\frac{2\times36.2\times0.225}{25}M$

• $36.2\times\frac{0.225}{2\times25}M$

• $\frac{25}{2\times36.2\times0.225}M$

What is the volume of water which is required to be added to 328 g of NaOH to form a solution whose concentration is 1.35m? [Na=23, O=16, H=1]

• 6.07 L

• 7.44

• 11.1 L

• 14.5 L

A sugar solution was made by mixing 12 g of glucose with 100 g of water. What is the percentage concentration by mass of the glucose in the solution? Give your answer to one decimal place.

• 12.0%(m/m)

• 11.4%(m/m)

• 13.6%(m/m)

• 10.7%(m/m)

Which of the following equations can be used to calculate the percentage by volume, %(v/v), of a solution?

• % (V/V)= $\left(\frac{volume\ of\ solution\ }{volume\ of\ solute\ }\right)\times100\%$

• % (V/V)= $\left(\frac{volume\ of\ solute\times volume\ of\ solution}{100\%}\right)$

• % (V/V)= $\left(\frac{100\%}{volume\ of\ solute\ \times volume\ of\ solution\ }\right)$

• % (V/V)= $\left(\frac{volume\ of\ solute\ }{volume\ of\ solution\ }\right)\times100\%$

Which of the following statements best describes the concentration of a solution?

• How reactive a solute is with water

• The amount of solvent dissolved in a certain volume of solute

• The amount of solute dissolved in a certain volume of solution

• How quickly a solute dissolves in a solvent

By dissolving 25 mL of oil in an amount of benzene, a solution of 40% percentage concentration (v/v) is obtained. Calculate the volume of benzene used to prepare the solution. Give your answer to one decimal place.

• 62.5 mL

• 65.0 mL

• 87.5 mL

• 37.5 mL