Chapter 4 Test Review

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

• 1074 mol

• 0.069 mol

• 1.07 mol

• 62.7 mol

What is the molarity of 4 grams of NaCl in 3800 mL of solution?  The molar mass of NaCl is 58.44 g/mol.

• 0.018 M

• 0.0011 M

• 1.052 M

• 0.062 M

How many grams of calcium hydroxide are needed to produce 500. mL of 1.66 M Ca(OH)₂ solution?  The molar mass of Ca(OH)₂ is 74.093 g/mol.

• 38.7 g

• 61.5 g

• 94.0 g

• 19.7 g

How many grams of solute are dissolved in 125.0 mL of 5.000 M NaCl?

• 0.625 g NaCl
• 56.3 g NaCl
• 36.53 g NaCl
• 0.625 mol NaCl

18.26 mL of a 1.50 M hydrochloric acid reacts with magnesium hydroxide. Calculate the moles of magnesium hydroxide needed for the reaction.
Mg(OH)_2(s)  +  2 HCl_(aq)  -->  2 H₂O_(l) + MgCl_2(aq)       

• 0.0274 moles Mg(OH)₂

• 0.0137 moles Mg(OH)₂

• 0.799 moles Mg(OH)₂

• 1.07 moles Mg(OH)₂

HCl_(aq) + NaOH_(aq) --> H₂O_(l) + NaCl_(aq)
25 mL of 1M HCl is required to react completely with with 20. mL of NaOH solution. What is the concentration of the NaOH solution?
Hint: determine first the moles of HCl that react.

• 0.8 M

• 1 M

• 1.25 M

• 1.5 M

Ca(OH)_2(aq) + 2 HCl_(aq) --> CaCl_2(aq) + 2 H₂O_(l)
A 50.0 mL sample of 1.0 M Ca(OH)₂ is required to react completely with 50.0 mL of HCl solution. Calculate the molarity of the HCl solution.
Hint: determine first the number of moles of Ca(OH)₂ that react.

• 1.0 M

• 0.50 M

• 2.0 M 

• 4.0 M

How many mL of 10.8 M HCl are required to make 100.0 mL of 3.00 M HCl?

• 27.8 mL

• 27.58 mL

• 2.8 mL

• 278 mL

18.26 mL of a 1.50M hydrochloric acid reacts with magnesium hydroxide. Calculate the mass of magnesium hydroxide needed for the reaction. 
  Mg(OH)₂  +  2 HCl  ->  2 H₂O + MgCl₂           

• 4.68 g Mg(OH)₂
• 0.789 g Mg(OH)₂
• 0.0274 Mg(OH)₂
• 1.07 g Mg(OH)₂

What volume, in milliliters, of 10.0 M NaOH is needed to prepare 300.0 mL of 2.00 M NaOH by dilution?

• 0.067 mL

• 60.0 mL

• 100 mL

• 125 mL