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15 March, 20:58

A 90.00 mL solution of NaCl and ethyl alcohol has 7.83 g of salt dissolved in the alcohol. Calculate the molar concentration of the solution. Remember to use significant digit rules.

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  1. 15 March, 21:48
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    The molar concentration of the solution is calculated as follows

    find the moles of NaCl used to make the solution

    moles = mass/molar mass

    mass = 7.83 g

    molar mass = 58.5 g/mol

    moles = 7.83 g / 58.5 g/mol = 0.134 moles

    molarity (concentration in mol/l) = number of moles/volume in liters

    volume in liters = 90ml/1000 = 0.09 liters

    molarity is therefore = 0.134 moles/0.09 L = 1.49 M
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