1.2 mole concept : e) concentration

What is molality?

• no of mole of solute in 1 liter of solution
• no of mole of solute in 1 kg of solvent

Total number of mol fraction for all component in the solution is equal to

• 1.0
• 0.95
• 0.50
• 2.0

The molarity of a solution prepared by dissolving 45.0 g of glucose (C₆H₁₂O₆) in 71.0 mL of water is

• 0.0352 M
• 3.52 M
• 0.352 M
• 35.2 M

How many grams of chloride ions are there in 100 mL of 1.90 M aqueous solution of sodium chloride?

• 13.5 g
• 6.74 g
• 0.67 g
• 1.35 g

What mass, in grams, of sodium sulfate is needed to make 275 g total of a 1.5% aqueous solution of sodium sulfate?

• 6.0

• 7.5

• 4.1

• 2.2

Tags

NGSS.HS-PS1-7

How many grams of solute are dissolved in 125.0 mL of 5.00 M NaCl (MM = 58.45)?

• 0.625 g NaCl
• 625 g NaCl
• 36.5 g NaCl
• 0.04 mol NaCl

Tags

NGSS.HS-PS1-7

If you want to prepare a 200 mL aqueous solution of MgO which is 20% by mass magnesium oxide, how many grams of magnesium oxide would be needed?(assume that the density of the solution is the same as the density of water)

• 40 grams

• 50 grams

• 30 grams

• 20 grams

How many grams of Calcium fluoride are needed to prepare 980 mL a 2.0 molar aqueous solution?

• 150 grams

• 2.0 grams

• 1.5 x 10⁵ grams

• 160 grams

What is the molarity of 4.0 g of NaCl (Molar mass=58.45) in 3,800 mL of solution?

• 0.018 M
• 0.001M
• 1.052 M
• 0.062 M

Calculate the mole fraction of benzene (C6H6) in a solution of 46.8 g benzene and 36.8 g of toluene (C7H8).

• 0.4
• 0.6
• 0.7
• 0.5