Ava asked in Science & MathematicsChemistry · 2 months ago

Please help with these questions on Molar Concentration!?

1) If 33.7 moles of MgCl₂ is dissolved to make 8.3L of solution, what is the molarity of the solution? Answer: [MgCl₂] = 4.1 M

2) If 275.2g of KMnO₄ is dissolved in to make 0.500 L of solution, what is the molar concentration of the solution? Answer: [KMnO₄] = 3.48 M

3) 205 L of carbon dioxide gas at STP is compressed and then dissolved in 10.0 L of water. What is the molar concentration of the resulting solution? Answer: [CO₂] = 0.915 M

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  • 2 months ago
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    1)

    Molarity = (33.7 mol) / (8.3 L) = 4.1 M

    ====

    2)

    Molar mass of KMnO₄ = (39.1 + 54.9 + 16.0×4) g/mol = 158.0 g/mol

    Molar concentration = (275.2/158.0 mol) / (0.500 L) = 3.48 M

    ====

    3)

    Molar volume of CO₂ at STP = 22.4 L/mol

    Molar concentration = (205/22.4 mol) / (10.0 L) = 0.915 M

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