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 Jan 12th 2018, 09:13 AM #1 Banned   Join Date: Dec 2017 Location: Columbus Junction Posts: 5 Chemistry Homework Help Hi. I have a task that I can`t solve by myself. In a lab a student dissolves 6.9 g of sodium chloride in 125 g of water what is the molaity concentration of a solution. Last edited by topsquark; Jan 13th 2018 at 03:55 PM.
 Jan 12th 2018, 09:57 PM #2 Senior Member   Join Date: Apr 2017 Posts: 154 Atomic mass of Na = 22.99 Atomic mass of Cl = 35.45 so atomic mass NaCl = 58.44 If 58.44 gms of salt is made up to 1 liter , this is said to have a molality concentration of 1 But we have 6.9 gms in 125 cc ....same concentration as 55.2 in a liter Almost 1 M (an adjustment needs to be made because 125cc was added to salt , and not made up to 125cc)

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