Molality

Molality = mol solute / kg solvent

Molality is defined as the number of moles of solute per 1 (kg) of solvent.

  • Solute = particles you dissolve
  • Solvent = the liquid you use for dissolving the particles

Molality (m) = mol solute / kg solvent

Example

MOLALITY CARTOON
Calculate molality (m) of 29.8 g of glucose (C6H12O6) dissolved in 622.8 g of water

Symbol Element Atomic weight Atoms
C Carbon 12.01 6
H Hydrogen 1.008 12
O Oxygen 16.00 6

Step 1. Find the molar mass of glucose

Molar mass

Step 2. Find the number of moles of glucose

molar-mass-1

Step 3. Find the concentration of the solution

Molality

29.8 g of glucose (C6H12O6) dissolved in 622.8 g of water
The concentration of the sugar solution is 0.267 m.

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