X=240 g NaCl salt dissolves in solution. Example: If we add 68 g sugar and 272 g water to 160 g solution having concentration 20 %, find final concentration of this solution. Solution: Mass of solution is 160 g before addition sugar and water. 100 g solution includes 20 g sugar 160 g solution includes X g sugar ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ X=32 g sugar Mass of solute after addition=32 + 68=100 g sugar Mass of solution after addition=272 +68 + 160=500 g 500 g solution includes 100 g sugar 100 g solution includes X g sugar ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ X= 20 % is concentration of final solution.
opinion and belief mean a judgment that someone thinks is true. ... belief is used if the judgment is certain and firm in a person's own mind without regard to the amount or kind of evidence.
