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is molarity greater than molality

is molarity greater than molality
 

Grade:11

1 Answers

Harishwar IIT Roorkee
askIITians Faculty 50 Points
9 years ago
Hi Student,
No, molality always greater than molarity
For molality, you find the mass of solution, then subtract the mass of solute to get the mass of H2O
So you use a slightly lower figure for kg of water then you would litres of solution.
Thus molality will always be slightly higher.

eg
1.00 M NaCl
moles NaCl = 1.00 moles
Volume solution = 1.00 L
molarity = 1.00 M

mass NaCl in 1L 1.00 M solution = molar mass x moles = 58.44 g/mol x 1.0 moles= 58.44 g
mass H2O (assuming density = 1 g/ml) = 1000 g - 58.44 g = 941.56 g = 0.94156 kg
molality = 1.00 mol / 0.94156 kg = 1.06 m

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