ss in grams of CH:OH (MM = 32.04 g/mol) would nee

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Question 11 of 12
What mass in grams of CH:OH (MM = 32.04 g/mol) would need to be
added to 240.1 g of water in order to lower the freezing point of water
by 12.0 °C? (Kf for water is 1.86 °C/m)
Transcribed Image Text:1 - Principles of Chemist X 101 Chem101 ml to liter - Google Search app.101edu.co Gmail YouTube Maps Translate News Question 11 of 12 What mass in grams of CH:OH (MM = 32.04 g/mol) would need to be added to 240.1 g of water in order to lower the freezing point of water by 12.0 °C? (Kf for water is 1.86 °C/m)
Expert Solution
Step 1

Molality (m) = moles of solute/maas of solvent(kg)

Moles = mass/MM 

     = w/32.04 

Mass of solvent= 240.1 g = 240.1/1000 = 0.2401 kg

Molality(m) = w/32.04×0.2401

∆Tf = Kf × m 

12.0 = 1.86 × w/32.04×0.2401

 

 

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