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What is the molality of a solution containing 15.0g NaCl dissolved in 50.0g water?

What is the molality of a solution containing 15.0g NaCl dissolved in 50.0g water?
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What is the molality of a solution containing 15.0g NaCl dissolved in 50.0g water?

User Novice
by
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2 Answers

2 votes

Answer:

C. 5.17

Step-by-step explanation:

User Thomaus
by
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7 votes
Hey there!

Molar mass NaCl = 58.44 g/mol

number of moles:

n = m / mm

n = 15.0 / 58.44

n = 0.2566 moles of NaCl

Volume in Kg :

50.0 g / 1000 => 0.05 Kg

Therefore :

Molality = moles of solute / volume

Molatity = 0.2566 / 0.05

Molality = 5.132 mol/kg
User Einpoklum
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