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5 March, 21:30

For an experiment, a biology student makes 1 liter of a solution containing the following substances, which are shown in the table below. Using the given information, fill in the missing parts of the table for each substance by (a) providing the formula weight and (b) calculating either the mass the student needs to weigh out or the number of moles that the student has, based on the amount weighed out. For each calculation, show your work. Be sure

to include the formula mass of water for CaCl2 • 2H2O and NaH2PO4 • H2O.

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  1. 5 March, 21:58
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    1. NaCl

    formula weight - 58,4 g/mol.

    number of moles - 0,14 mol

    mass - 58,4 g/mol · 0,14 mol = 8,176 g.

    2. KCl

    formula weight - 74,55 g/mol.

    number of moles - 0,005 mol

    mass - 0,372 g.

    3. C₆H₁₂O₆

    formula weight - 180,1 g/mol.

    number of moles - 0,0056 mol

    mass - 180,1g/mol · 0,0056 mol = 1,01 g.

    4. NaHCO₃

    formula weight - 84 g/mol.

    number of moles - 0,0262 mol

    mass - 2,2 g.

    5. CaCl₂·H₂O

    formula weight - 147 g/mol.

    number of moles - 0,001 mol

    mass - 0,15 g.

    6. MgSO₄

    formula weight - 120,3 g/mol.

    number of moles - 0,0008 mol

    mass - 0,096 g.

    7. NaH₂PO₄·H₂O

    formula weight - 138 g/mol.

    number of moles - 0,001 mol

    mass - 0,14 g.
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