Answers

2015-07-09T19:33:27+08:00


Since the given is in grams, convert it first to moles.

Molecular weight of NaCN (the solute):
Na = 11
C = 12
N = 14
TOTAL = 37 grams

1.9 x 10^-4 g. NaCN   1 mole   =  0.00005135135
                                 37 grams


Given:
Mole of solute: 0.00005135135 mol

Liter of solution: 100 ml/1000 = 0.1 L.

Molarity = moles of solute
               liter of solution
             = 0.00005135135
                  0.1 L
             = 0.0005135135 mol/L. or 5.1 x 10^-4 mol/L.
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