Practice Mole Fraction (1.2.5) - Solutions

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6 sample questions

Question 1.
Calculate the mole fraction of CO2 in a mixture of 2 moles of CO2 and 3 moles of O2.
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Use the formula x = n_A / (n_A + n_B).
Question 2.
If you have 5 moles of NaCl in a total of 20 moles of solution, what is the mole fraction of NaCl?
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Remember to total the moles before calculating.
3Question 3.
What is the mole fraction of a component in a solution?
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Think about how it relates to the total amount of substance present.
4Question 4.
True or False: The sum of all mole fractions in a solution always equals 1.
- True
- False
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Consider how parts relate to a whole.
Question 5.
A solution consists of 50 grams of KCl dissolved in 200 grams of water. Calculate the mole fraction of KCl and water in the solution.
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First, convert the mass into moles.
Question 6.
In a mixture of two gases, if the partial pressures are 0.5 atm for gas A and 1 atm for gas B, determine the mole fractions of gases A and B. Assume total pressure is 1.5 atm.
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Remember, the total pressure is crucial for calculating mole fractions.

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