Number of moles in 1 kg of solvent is called_________________?
Correct answer: C. molality
- A. normality
- B. molarity
- C. molality
- D. mole fraction
Explanation
Molality is defined as the number of moles of solute present in 1 kg of solvent, with units mol kg−1. Students may choose molarity, but molarity uses 1 dm3 of solution rather than 1 kg of solvent.
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About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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