With the addition of water after a certain amount is taken from a sample containing 5% (w / w) NaCl solved and analyzed according to the Volhard method. 0.1M AgNO₃ into this solution 50 ml of the solution is added. Unreacted AgNO₃, 0.2 M NH₄SCN back titrated with the solution. That 7.9 ml NH₄SCN solution is spent in this titration. What is the amount taken from the sample? (NaCl: 58.5 g / mol)