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24 June, 16:12

What mass (in g) of NH3 must be dissolved in 475 g of methanol to make a 0.250 m solution?

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  1. 24 June, 19:07
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    We need 2.02 grams of NH3

    Explanation:

    Step 1: Data given

    Mass of methanol = 475 grams

    Molality of the solution = 0.250 M

    Molar mass of NH3 = 17.03 g/mol

    Molar mass of = methanol = 32.04g/mol

    Step 2: Calculate moles NH3

    Molality = 0.250 m = mol NH3 / 0.475 kg

    moles NH3 = 0.250 molal * 0.475 kg

    Moles NH3 = 0.11875 moles

    Step 3: Calculate the mass of NH3

    Mass NH3 = moles NH3 * molar mass NH3

    Mass NH3 = 0.11875 mol * 17.03 g/mol

    Mass NH3 = 2.02 grams

    We need 2.02 grams of NH3
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