D 11/26/2017 11:55 PM 5.7/611/26/201 7 05:17PM ore Print lCalculator Periodic Ta

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D 11/26/2017 11:55 PM 5.7/611/26/201 7 05:17PM ore Print lCalculator Periodic Table Print -1 Periodic Table Calculator Question 13 of 22 IncorrectIncorrectIncorrect& IncorrectIncorrect Sapling Learning For each solution below calculate the millimoles of solute. a) 2.05 L of 0.00710 M NaCN 50 Number 14.5 mmol NaCN 50 b) 183 mL of a solution containing 6.52 ppm CaCO Number mmol CaCo, Tools x 10 Hint OPrevous Gw0 Up & View Souton Check Answer Next 100 about us careers privacy policyterms of use contact us 2 3 4 6

Explanation / Answer

1>

Molarity = moles of solute/ volumes ( in liters)
0.00710 = moles/ 2.05
moles = 0.014555

the millimoles of solute = 14.555 mmols

2>

1 ppm = parts per million

1ppm = 1mg of solute/ 1kG of solution

Density of water = 1 g / mL

183 mL of solution * 1g/mL = 0.183 kG of solution


6.52 ppm =( 6.52mg CaCO3 / 1kg of solution) * 0.183 kG of solution
  
   = 1.19316 mg of CaCo3

Molecular wt of CaCO3 = 100 g/mol

therefore millimoles of CaCo3 = 1.19316/ 100 = 0.0193 mmols

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