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Answer 1

May 5, 2017

#"Molarity"~=5*mol*L^-1#

#"Molarity"# #=# #"Moles of solute"/"Volume of solution"#.

And thus............

#"Molarity"# #=# #((290.0*g)/(58.44*g*mol^-1))/(1*L)=4.96*mol*L^-1.#

This is impossibly salty sea water. You are out by an order of magnitude. This site reports a salinity of #35*g*L^-1#