Molarity and Molality

What is the molarity of 4 g of NaCl (MM=58.45) in 3,800 mL of solution?

• 0.018 M
• 0.0011 M
• 1.052 M
• 0.062 M

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

Find the molarity of 186.55 g of sucrose, C₁₂H₂₂O₁₁ (MM = 342) in 250 mL of water.

• 2.18 M
• 0.746 M
• 1.18 M
• 0.545 M

What volume of a 0.88 M solution can be made using 130. grams of FeCl₂

• 3.9 L
• 2.8 L
• 0.75 L
• 1.2 L

100 grams of sucrose, C₁₂H₂₂O₁₁, is dissolved in 1500 g of water.  What is the molality?

• 5.17 m C₁₂H₂₂O₁₁
• 2.51 m C₁₂H₂₂O₁₁
• 0.19 m C₁₂H₂₂O₁₁
• 0.88 m C₁₂H₂₂O₁₁

Tags

NGSS.HS-PS1-5

A 0.556 g sample of an unknown compound is dissolved in 45.31 g of water.  Find the molar mass of the unknown compound if the molality of the solution if found to be 0.35 m.

• 0.072 g/mole
• 34.75 g/mole
• 0.029 g/mole
• 56.11 g/mole

If I make s solution by adding water to 27.72 g of methanol (CH₃OH) until the final volume of the solution is 275 mL, what is the molarity of methanol in this solution?

• 5.66 M CH₃OH
• 3.13 M CH₃OH
• 0.77 M CH₃OH
• 2.19 M CH₃OH

When 20 grams of potassium chlorate, KClO₃, is dissolved in 100 grams of water at 80 ºC, the solution can be correctly described as:

• supersaturated
• saturated
• unsaturated

Tags

NGSS.HS-PS1-5

How many grams of K₂Cr₂O₇, are soluble in 100 g of water at 95 ºC?

• 83 grams
• 75 grams
• 40 grams
• 12 grams

What is the formula for molality?

• moles/grams
• moles/kilograms
• moles/liters
• moles/milliliters

Tags

NGSS.HS-PS1-5