Number of mmol of AgNO3 = 269 x 10-3
Volume of solution = 300 mL = 300 x 10-3 L
Concentration in mmol/L = number of mmol/volume of solution in L
= 269 x 10-3mmol/ 300 x 10-3 L
= 9 x 10-1 mmol/L
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