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Molarity Problems

Molarity Problems. Molarity = mol/L. #1. What concentration solution would be prepared if 45 g of CuCl 2 were dissolved in 1.3 L of solution? = 0.334 mol CuCl 2 M = mol /L .3346969 mol / 1.3 L = 0.26 M CuCl 2. #2.

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Molarity Problems

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  1. Molarity Problems Molarity = mol/L

  2. #1 • What concentration solution would be prepared if 45 g of CuCl2 were dissolved in 1.3 L of solution? • = 0.334 mol CuCl2 • M = mol/L • .3346969 mol / 1.3 L = 0.26 M CuCl2

  3. #2 • What volume of a 2.0 M solution of HCl do you need to get 1.2 mol of HCl? • M = mol/L • 2.0 M = 1.2 mol/ V • V = 0.60 L

  4. #3 2 • HNO3 + Zn  H2 + Zn(NO3)2 • If you have .65 L of 1.2 M HNO3 and you react it completely what volume of H2 gas will you produce at STP? 1.2 M HNO3 x .65 L = .78 mol HNO3 =.39 mol H2 = 8.7 L at STP

  5. #4 2 • HNO3 + Zn  H2 + Zn(NO3)2 • If you have .65 L of 1.2 M HNO3 and you react it completely, what conc. of Zn(NO3)2 will be left if the volume increases to .75 L? 1.2 M HNO3 x .65 L = .78 mol HNO3 = .39 mol Zn(NO3)2 .75 L = 0.52 M Zn(NO3)2

  6. #5 2 3 3 • Fe + H2SO4 Fe2(SO4)3 + H2 • If 350 mL of 2.3 M H2SO4 is completely reacted, what is the volume of hydrogen gas produced at 24o C and 114 kPa? .35 L x 2.3 M = .805 mol H2SO4 =.805 mol H2 PV = nRT =17 L H2 114 kPa V = .805 mol (8.31) 297 K

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