Chem-is-try: Please Help How To Solve Problems On Molality?

Problem 1: What mass ( kg ) of the solvent diethyl ether should be mixed with 1.802 L of the solute (CH3)2CO to prepare a solution that is 5.44 m (CH3)2CO.
Problem 2:If 81.85 g of a substance is dissolved in 484.8 g of water solvent, the freezing point of the solution is -5.05 oC. Calculate the apparent molar mass (g/mol) of substance.

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One Response to “Chem-is-try: Please Help How To Solve Problems On Molality?”

  1. 5.44 m
    1.802 L (CH3)2CO
    let x = density of (CH3)2CO
    M = molar mass of (CH3)2CO
    grams (CH3)2CO = 1.802x
    mol (CH3)2CO = 1.802xM
    ———–
    kg solvent = (1.802xM) / 5.44 m
    ———–
    :-|