How much of a change in freezing point would the ocean experience if the glaciers and...

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Chemistry

How much of a change in freezing point would the oceanexperience if the glaciers and icebergs melted? Here is what i haveso far:
If all of the glaciers and ice caps on earth melted, 24,064,000cubic kilometers of fresh water would become mixed in with theoceanâ€™s 1,338,000,000 cubic kilometers of saline water.
24,064,000 km^3 + 1,338,000,000 km^3 = 1,362,064,000 km^3
Currently, the oceanâ€™s salinity is 3.5%(http://water.usgs.gov/edu/whyoceansalty.html). The oceanâ€™ssalinity would decrease to 3.4% if all of the glaciers and ice capswere to melt.
1,338,000,000 km^3 saline water x .035 = 46,830,000 km^3salt
46,830,000 km^3 salt / 1,362,064,000 cm^3 = .034 0.034 x 100 =3.4%
Currently the freezing point of the oceanâ€™s surface is -1.8degrees Celsius (28.8 degrees Fahrenheit)(http://nsidc.org/cryosphere/seaice/index.html).
I know it's a freezing point depression question and i use
Delta Tf = m x Kf
Kf of water is 1.86 C/m
But I can't figure out how to get 46,830,000 km^3 salt intomolality (moles/kg solvent)
Thanks!!

Answer & Explanation Solved by verified expert

3.6 Ratings (649 Votes)

Volume of fresh water 24064000 cubic kilometers volume of saline water 1338000000 cubic kilometers Total volume 1362064000 km3 We may assume that density of sea water does not change on addition of fresh water From See Answer

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