Mole concept part 4

To calculate the molarity of a solution when the solute is given in grams and the volume of the solution is given in millilitres, you must first …

• convert grams to moles, but leave the volume of solution in millilitres

• convert volume of solution in millilitres to litres, but leave grams to moles

• convert grams to moles and volume of solution in millilitres to litres

• none of the above

The molarity of an aqueous solution of CaCl is defined as the

• moles of CaCl per millilitre of solution

• grams of CaCl per litre of water

• grams of CaCl per millilitre of solution

• moles of CaCl per litre of solution

Calculate the molarity of a sugar solution if 4 litres of the solution contains 8 moles of sugar?

• 0.5 M

• 8 M

• 2 M

• 80 M

What is the molarity of a solution containing 5 moles of solute in 250 millilitres of solution?

• 20 M

• 15 M

• 0.104 M

• 1.25 M

How many moles of NaOH are needed to dissolve in water to make 4 litres of a 2.0 M solution?

• 0.50 M

• 2 M

• 8 mol

• 0.5 mol

How many moles of Na are needed to make 4.5 litres of a 1.5 M Na solution?

• 6.75 mol

• 0.33 M

• 0.33 mol

• 3 M

An aqueous 2.0 M hydrochloric acid solution is prepared with a total volume of 0.350 L. What mass of hydrochloric acid is needed for the solution?

• 25.5 g

• 33.7 g

• 12.8 g

• 72.9 g

A 0.674 M cobalt(II) chloride solution is prepared with a total volume of 0.075 L. What mass of CoCl₂ is needed for the solution?

• 0.070 g

• 6.25 g

• 0.051 g

• 6.57 g

A 0.355 L soft drink contains 45.5 g of sucrose, which has a molecular weight of 342.3 g mol^-1. What is the molar concentration of sucrose in the soft drink?

• 37.4 M

• 0.047 M

• 0.374 M

• 47.1 M

A 0.250 L sample of seawater contains 77.4 g of NaCl, which has a molecular weight of 58.44 g mol^-1? What is the molar concentration of sodium chloride in the seawater?

• 0.331 M

• 310 M

• 234 M

• 5.30 M