Chem trick question

[Kami]

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Whats the osmotic pressure at STP of a solution made from 1L NaCl(aq) containing 117 g of NaCl?

 

[Law0830]

Hope this helps:
osmotic pressure is equal to Mrti. Get the molarity r is constant temperature at STP is 273 and the i value of NaCl is 2. Multiply all that.

 

[Dion]

I did the problem this way:

- convert 117 g NaCl to moles
- I use the PV = nRT formula
- I am given V (1 liter), R is a constant, at T is standard at 273
So I plug the numbers in and get:
(x atm)(1 liter) = (2.017 moles) (0.08206 latm/Kmol)(273 K)

I get 45.2 atm for pressure

 

[doc toothache]

Strictly speaking the van't Hoft constant is 1.8 rather than 2 due to ion pairing.
(117 g of NaCl=2 moles)