Chemistry

Question

A solution of H2SO4(aq) with a molal concentration of 5.74 m has a density of 1.238 g/mL. What is the molar concentration of this solution?

1 Answer

  • molality: m
    number of moles of solute: n
    Molarity: M
    density of solution: d
    V = volume of solution in liters
    K = mass of solvent in Kg
    W: molar mass of solute


    Formulas:

    m = n/K
    M = n / V

    M = d*m / (1 + m*W)

    d = 1.238 g/mL = 1.238 kg/liter
    m = 5.74
    W H2SO4 = 2*1g/mol + 32g/mol + 4*16g/mol = 98 g/mol = 0.098 kg/mol

    M = (1.238 kg/liter * 5.74 mol/kg) / (1 + 5.74 mol/kg * 0.098g/mol) = 4.55

    Answer: 4.55
NEWS TODAY

You May Be Interested