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what is the answer?
D DA 17% D Fri 10:12 AM a e E Safari File Edit View History Bookmarks Window Help saplinglearning.com Everett Community College CHEM 162 Fall16 MosSER: HW 12 Molecu Weight Calculator (Molar Mass Attempts Score /20/2016 11:55 PM A 26.7/30 11/4/2016 07:39 PM ebook Assignment Information Prin Calculato Periodic Table Available From 9/19/2016 12:00 A 00 13 Question 22 of 27 ncorrect Due Date: ncorrec 11/20/2016 11:55 00 Map 14 EA Sapling Learning Points Possible 30 00 Grade Category: Graded 15 Assuming 100% dissociation, calculate the freezing point and boiling point of 2.39 m Na2SO4(aq) Description: Constants may be found here. 16 00 Number Policies HW VAM 00 17 You can check your answers. 18 00 You can view solutions when you com Number up on any question. T. 10% 00 19 You can keep trying to answer each q 20 you get it right or give up. There is no penalty for incorrect answ 00 21 22 eTextbook 00 23 O Help With This Topic 00 24 O Web Help & Videos There is a hint available! 25 00 View the hint by clicking on the bottom divider bar. Click on the O Technical Support and Bug Rep divider bar again to hide the hint. 00 26 Close Previous 3 Give Up & View Solution Check Answer Next Exit Hin 27 O 20 2016 Sapling Learning, Inc 39 about us erms of use help partners Careers privacy policy Contact usExplanation / Answer
Na2SO4 --> 2Na+ + SO4-2
total ions i = 2+1 = 3
so
dTf = -Kf*m*i
Kf for water = -1.86
so
dTF = -1.86*2.39*3 = -13.3362 °C
so..
Tf mix = 13.3362
for boiling point
dTb = Kb*m*i
dTb = 0.512*2.39*3 = 3.67104 °C
Tfinal = 100 + 3.67104= 103.67104°C
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