The unit of molality is__________________?
Correct answer: B. moles kg-1
- A. moles dm-3
- B. moles kg-1
- C. gram dm-3
- D. none
Explanation
Molality is defined as the number of moles of solute dissolved in 1 kilogram of solvent, so its unit is moles kg-1. The common mistake is option a, moles dm-3, which is the unit of molarity and uses the volume of solution rather than the mass 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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