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30 August, 07:09

A 17.0-g sample of hf is dissolved in water to give 2.0 x 10 2 ml of solution. the concentration of the solution is:

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  1. 30 August, 07:25
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    Molar concentration is the number of moles of solute dissolved in 1 L of solution

    the mass of HF dissolved - 17.0 g

    molar mass of HF - 20 g/mol

    number of moles of HF = mass dissolved / molar mass

    number of moles of HF = 17.0 g / 20 g/mol = 0.85 mol

    volume of solution is 200 mL

    number of HF moles in 200 mL = 0.85 mol

    therefore number of HF moles in 1000 mL is - 0.85 mol/200 x 1000 = 4.25 mol/L

    molar concentration of HF solution is 4.25 M
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