4.9g of a salt is dissolved in water within a flask of volume 250ml. What is the mass/volume % of the solution ? And if the density of the solution is 1.25g per cm cube, then what is the mass% of the solution?
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Answer:
Molarity=
Molar mass×100
% by mass×1000×density
=
98×100
40×1000×1.2
=4.89M≈4.9M
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