Mole Fraction Concept in Chemistry
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Questions and Answers

What is the mole fraction of a component defined as?

  • Number of moles of the component divided by the total number of moles of all the components (correct)
  • Total number of moles of all the components divided by the number of moles of the component
  • Total number of moles of all the components minus the number of moles of the component
  • Number of moles of the component multiplied by the total number of moles of all the components

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

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

    • What is the sum of all the mole fractions in a given solution?

  • 1 (correct)
  • 0
  • More than 1
  • Less than 1

    • What is the unit of mole fraction?

    <p>Dimensionless</p> Signup and view all the answers

    In a solution containing i number of components, how is the mole fraction of a component calculated?

    <p>ni / (n1 + n2 + ... + ni)</p> Signup and view all the answers

    What is the mole fraction of ethylene glycol (C2H6O2) in a solution containing 20% of C2H6O2 by mass?

    <p>0.4</p> Signup and view all the answers

    What is the mole fraction of glycol in a solution that contains 0.322 mol of glycol and 4.444 mol of water?

    <p>0.068</p> Signup and view all the answers

    What is the mole fraction of water in a solution that contains 0.322 mol of glycol and 4.444 mol of water?

    <p>0.932</p> Signup and view all the answers

    If the mole fraction of glycol is 0.068, what is the mole fraction of water in the same solution?

    <p>0.932</p> Signup and view all the answers

    What is the relationship between the mole fraction of a component and the total number of moles of all components in a solution?

    <p>The mole fraction of a component is the ratio of the number of moles of that component to the total number of moles of all components.</p> Signup and view all the answers

    Can the mole fraction of a component be greater than 1?

    <p>No, because the mole fraction is a ratio.</p> Signup and view all the answers

    Why is the mole fraction of a component important in chemistry?

    <p>It is a measure of the ratio of the number of moles of the component to the total number of moles of all components.</p> Signup and view all the answers

    What is the mole fraction of benzene in vapour phase if 80 g of benzene is mixed with 100 g of toluene?

    <p>0.556</p> Signup and view all the answers

    What is the proportion of oxygen in air by volume at 298 K?

    <p>20%</p> Signup and view all the answers

    What is the Henry's law constant for oxygen at 298 K?

    <p>3.30 × 10^7 mm</p> Signup and view all the answers

    What is the i value of CaCl2?

    <p>2.47</p> Signup and view all the answers

    What is the total pressure of the air at 298 K?

    <p>10 atm</p> Signup and view all the answers

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