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16-08-2017
Chemistry

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

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Willchemistry Willchemistry

16-08-2017

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

Answer Link

08-12-2020

Answer:

C. 5.17

Explanation:

Answer Link

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