simple work need it in one half hour chem

Solution Molarity and Dilution Worksheet

Molarity

(1) 0.126 moles of sodium hydroxide (NaOH) is dissolved in enough water to make the solution volume 0.500 L. What is the molarity of the solution?

(2) A saturated solution of NaCl is made by 0.0648 moles of NaCl in enough water to make 12 mL of solution. Calculate the molarity of the solution.

(3) 16.0 g of HCl(g) is dissolved in enough water to make a solution of 0.200 L. Calculate the molarity of the solution.

(4) 2.0911 g of Pb(NO3)2 is dissolved in enough water to produce 235.0 mL of solution. What is the concentration of the solution in mol/L?

(5) How many moles of BaCl2 is contained in 0.250 L of a 0.455 M BaCl2 solution?

(6) How many moles of LiCl is contained in 22.44 L of a 0.050 M LiCl solution?

(7) Water open to the air contains about 2.68x10-4 M of dissolved oxygen gas. How many moles of oxygen is contained in a 474 mL bottle of water?

(8) A student makes a solution by dissolving 50.0 g of silver acetate to make 500.0 g of solution (solution density = 0.992 g/mL). What is the molarity of the silver acetate solution?

(9) What is the concentration in M of a 35.0 mass% solution of KOH (density 1.10 g/mL)?

(10) What is the concentration in mass% of a 0.222 M solution of K2SO4 dissolved in water (solution density 0.990 g/mL)?

(11) What is the concentration, in M, of Na+ in a 2.00 M solution of NaCl?

(12) What is the concentration, in M, of Li+ in a 0.950 M solution of Li2SO4?

(13) What is the concentration, in M, of Cl- in a 0.373 M solution of AuCl3?

(14) A certain amount of Ca(OH)2 dissolves in water to make a solution of 0.150 M Ca2+. What is the concentration of the OH- in mol/L?

(15) A solution makes a dilute solution of phosphoric acid according to H3PO4(l) → 3 H+(aq) + PO43-(aq). The solution made contains 0.726 M H+(aq). What is the concentration PO43- in the solution?

Dilutions

(16) What is the concentration of a solution made by taking 0.340 L of a 1.00 M solution and adding water until the final volume is 0.500 L?

(17) What is the concentration of a solution made by taking 50.0 mL of a 0.229 M HNO3 solution and adding water until the final volume is 105.0 mL?

(18) What volume of a 2.40 M solution is required to make 1.00 L of a 0.333 M solution?

(19) What volume of a 0.1337 M solution is required to make 100.0 mL of a 0.05050 M solution?

(20) 16.0 mL of a 0.0456 M PbSO4 is diluted by adding 35.0 mL of water. What is the final concentration of the PbSO4 solution?