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24 December, 23:36

25.0 g of barium hydroxide is dissolved in 120.0g of water. What is the morality?

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  1. 25 December, 02:27
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    Molarity: M = #moles of solute / liters of solution

    # moles = mass / molar mass

    Molar mass calculation

    Barium hydroxide = Ba (OH) 2

    Atomic masses

    Ba = 137.4 g/mol

    O=16 g/mol

    H=1 g/mol

    Molar mass of Ba (OH) 2 = 137.4 g/mol + 2*16g/mol + 2*1 g/mol = 171.4 g/mol

    # mol = 25.0g/171.4 g/mol = 0.146 mol

    For the volume of water use the fact that the density is 1g/ml., so 120 g = 120 ml = 0,120 liters.

    M = 0.146mol / 0.120 liters = 1.22 mol/liter
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