The sum of mole fractions of solute and solvent is always equal to:
Correct answer: C. 1.0
- A. 0.1
- B. 10.0
- C. 1.0
- D. Zero
Explanation
The fundamental concept of mole fractions dictates that the sum of the mole fractions of all components in a solution, including both solute and solvent, must equal 1. This is because mole fraction is a way of expressing the concentration of a component in a mixture, and all component concentrations together must sum to the whole, which is 1.0. Options A, B, and D are incorrect because they do not satisfy this fundamental principle: 0.1 and zero are too low, and 10.0 is too high.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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Concentration units express the amount of solute in a given amount of solution or solvent. Calculations cover molarity, molality, normality, mole fraction, mass percentage, volume percentage, parts per million and dilution, including the effect of temperature on volume-based units and the distinction between molarity and molality.
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