Calculate the molality of an aqueous solutionthat contains 25.100 % (w/w) in KCN

Question

Calculate the molality of an aqueous solutionthat contains 25.100 % (w/w) in KCN.
5.15 Calculate the mole fraction of KCN in thesolution described above (25.100 % (w/w) in KCN PLEASE I NEED THE SECOND PART ONLLY, BECAUSE 5.15 IS THEANSWER FOR THE FIRST PART Calculate the molality of an aqueous solutionthat contains 25.100 % (w/w) in KCN.
5.15 Calculate the mole fraction of KCN in thesolution described above (25.100 % (w/w) in KCN PLEASE I NEED THE SECOND PART ONLLY, BECAUSE 5.15 IS THEANSWER FOR THE FIRST PART

Explanation / Answer

We Know that :      mole fraction of KCN = number of moles of KCN / Total number of molesof the solution              numberof moles of KCN = 25.1 g / 65.1 g / mol                                                      = 0.385 moles              number of moles of water = 74.9 g / 18 g /mol                                                         = 4.161 mol                XKCN   =   nKCN /    nKCN + nH2O                              = 0.385 moles / 0.385 moles + 4.161mol                               = 0.0846                              = 0.385 moles / 0.385 moles + 4.161mol                               = 0.0846

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