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18 May, 19:00

Determine the mass in grams of sucrose that must be added to 26 g of water to make a 1.15 m solution. Enter your answer to 2 decimal places.

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Answers (2)
  1. 18 May, 21:16
    0
    10.23 grams of sucrose should be added.

    Explanation:

    1.15 m means molality (moles of solute in 1kg of solvent)

    1.15 moles of sucrose are contained in 1 kg of solvent (1000 g)

    Let's determine the moles in our mass of solvent.

    Firstly we convert the g to kg → 26 g. 1kg/1000g = 0.026 kg

    m. mass (kg) = 1.15 mol/kg. 0.026kg → 0.0299 moles.

    Finally we convert the moles to mass (mol. molar mass)

    0.0299 mol. 342.3 g/mol = 10.23 g
  2. 18 May, 21:18
    0
    The mass of sucrose is 10.23 grams

    Explanation:

    Step 1: Data given

    Mass of water = 26 grams = 0.026 kg (=solvent)

    Molality = 1.15 m

    Step 2: Calculate moles sucrose

    molality = moles sucrose / mass water

    1.15 = moles sucrose / 0.026 kg

    moles sucrose = 1.15 * 0.026

    moles sucrose = 0.0299 moles

    Step 3: Calculate mass of sucrose

    mass sucrose = moles sucrose * molar mass sucrose

    mass sucrose = 0.0299 moles * 342.3 g/mol

    mass sucrose = 10.23 grams

    The mass of sucrose is 10.23 grams
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