O. Show your Work 1.A How many grams are in 15 M Naci? B. What is theg% of .15mo

Question

O. Show your Work 1.A How many grams are in 15 M Naci? B. What is theg% of .15mol/L NaCl? 2. A What is the activity of a 0.3 mo/L CaClz solution? B. Assuming complete dissociation, what is the osmolarity of this solution? 3 A B. How many grams are present in a 5 0 uML solution of epinephrine? what is the mg% of the above solution? A solution of 0 9 g% NaCl is approximately equal to the osmotic pressure of mammalian cells. A What is the molarity of this solution? B What is the osmolarity of this solution? 5. What is the osmolarily of 9 45 mol/t sucrose?

Explanation / Answer

1. A) Mol mass of NaCl = 58.5

Mass of 0.15 mole NaCl = moles x mol.mass = 0.15x58.5 = 8.775 grams

B) 0.15 mol/L NaCl solution means 0.15 mole in 1 lit (1000 grams) water

Percentage of NaCl in 0.15 M solution = (8.775/1000) x 100 = 0.8775%

2. A) activity = 0.3 M

CaCl2 ----------> Ca2+ + 2 Cl-

1 mole of CaCl2 produce 3 ions (1 mole of Ca2+ and 2 moles of Cl-) on ionization in water.

B)  Molarity of 0.3 mol/L CaCl2 solution = 0.3M

Osmolarity = molarity x number of species produced during ionization = 0.3 x 3 =0.9

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