NaCl is dissolved in H2O and its concentration is 0.9 % mass. Find the number of moles and number of molecules present in NaCl. (HINT: Mass% = Mass of solute / Mass of solution * 100)
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The percentage concentration of any solution is most commonly expressed as mass percent:
Mass % of any component of the solution =
(Mass of the component in the solution / Total mass of the solution) x 100
Other methods are:
Volume percentage:
Volume % of a component =
(Volume of the component/Total volume of the solution) x 100
Mass by volume percentage:
It is the mass of solute dissolved in 100 mL of the solution.
i.e. Mass by Volume percentage =
(Mass of solute in grams/Volume of solution in mL) x 100
Mass % of any component of the solution =
(Mass of the component in the solution / Total mass of the solution) x 100
Other methods are:
Volume percentage:
Volume % of a component =
(Volume of the component/Total volume of the solution) x 100
Mass by volume percentage:
It is the mass of solute dissolved in 100 mL of the solution.
i.e. Mass by Volume percentage =
(Mass of solute in grams/Volume of solution in mL) x 100
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