Mole Fraction Calculation in Solutions
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Questions and Answers

What is the definition of mole fraction of a component in a solution?

  • Total mass of the component
  • Number of atoms of the component
  • Number of moles of the component divided by total number of moles of all components (correct)
  • Number of grams of the component

    • In a binary mixture, if the number of moles of components A and B are nA and nB respectively, what is the mole fraction of A?

  • nA/nB
  • nA/(nA + nB) (correct)
  • nA + nB
  • nA * nB

    • What does the sum of all mole fractions in a solution equal to?

  • 0
  • 2
  • 1 (correct)
  • -1

    • If a solution contains 20% ethylene glycol by mass, what is the mole fraction of ethylene glycol assuming 100g of solution?

    <p>$\frac{16}{62}$ (A)</p> Signup and view all the answers

    How can mole fraction be useful in describing gas mixtures?

    <p>Relating physical properties like vapor pressure with solution concentration (C)</p> Signup and view all the answers

    What would be the mole fraction unit when relating physical properties of solutions?

    <p>Moles per liter (mol/L) (C)</p> Signup and view all the answers

    What is the mole fraction of toluene in the given binary mixture?

    <p>0.467 (C)</p> Signup and view all the answers

    What is the major component of air by volume at 298 K, according to the given information?

    <p>Oxygen (A)</p> Signup and view all the answers

    Calculate the molarity of the CaCl2 solution when dissolved in 2.5 liters of water.

    <p>2.4 M (D)</p> Signup and view all the answers

    What is the mass of K2SO4 dissolved in water to prepare the given solution?

    <p>30 mg (B)</p> Signup and view all the answers

    Determine the osmotic pressure of the solution prepared with 25 mg of NaCl in 2 liters of water at 25°C.

    <p>0.45 atm (A)</p> Signup and view all the answers

    If a binary mixture has a mole fraction of benzene as 0.325, what is the mole fraction of toluene in the mixture?

    <p>0.425 (B)</p> Signup and view all the answers

    What is the mole fraction of water in the given mixture?

    <p>0.932 (C)</p> Signup and view all the answers

    How many moles of NaOH are present in a 450 mL solution that has a molarity of 0.278 M?

    <p>0.125 mol (B)</p> Signup and view all the answers

    What is the mass of water in kilograms needed to make a 1.00 m solution of KCl with 1 mol of KCl?

    <p>1 kg (C)</p> Signup and view all the answers

    If the molarity of a solution is 0.25 M, how many moles of solute are present in 2 liters of the solution?

    <p>1 mol (C)</p> Signup and view all the answers

    What does a 0.322 mole fraction of water imply in a binary mixture?

    <p>More water than solute present (A)</p> Signup and view all the answers

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