How many grams of sodium chloride (NaCl) are needed to make 200.0 mL of a 2.5 M solution?

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Answer 1 · 2018-03-19T13:41:03

Approx...#29*g#....

By definition, #"molarity"="moles of solute"/"volume of solution"#...and thus it has units of #mol*L^-1#...

And so (i) we work out the molar quantity...

#"moles of solute"="molarity"xx"volume of solution"#

#-=2.50*mol*L^-1xx200.0*mLxx10^-3*L*mL^-1#

#-=0.50*mol#...

And to get the mass, we simply multiply the molar quantity by the molar mass... i.e.

#0.50*molxx58.44*g*mol^-1=??*g#