Regents Chemistry Concentration Solutions

How do you calculate the molarity of a solution?

• By tasting it.
• Dividing the moles of solute by the L of  solution
• Dividing the moles of solute by the kg of  solvent
• By adding the sum of the molecular weight of the elements in the substance.

A 3 M solution has how many moles per liter?

• 1
• 2.5
• 4
• 3

What is the difference between concentration and saturation?

• concentration is a fixed % and saturation refers to amount of solute dissolved
• concentration refers to amount of solute dissolved and saturation is a fixed %. 
• Nothing
• All of the above

Tags

NGSS.HS-PS1-5

Molarity is measured in

• moles per kg
• moles per L
• moles per kJ
• moles per mL

Tags

NGSS.HS-PS1-5

What is the molarity of 2.5 mol of NaOH in 12.0 L of solution?

• 0.21 M
• 30 M
• 4.8 M
• 20.8 M

What is the molality of a solution containing 1.3 mol in 13.4 kg of solution?

• 9.7 m
• 17.42 m
• 0.097 m

What is the concentration, in percent by mass, of 0.62 g of solute in 45.0 g of solution?

• 0.014 %
• 1.4 %
• 0.13%

What is the concentration, in percent by volume, of 15.3 mL of solute in 2.65 L of solution?

• 0.58%
• 0.0058%
• 5.8%

What is the mole fraction of ethanol when 0.504 mol of ethanol are mixed with 4.06 mol of water?

• 0.110
• 0.124
• 0.097

Tags

NGSS.HS-PS1-7

How many moles of NaCl are present in a solution with a molarity of 8.59M and 125 mL of solution?

• 1.07 gram
• 62.7 mol
• 1.07 mol
• 62.7 grams