Taking into account the definition of molarity, the molarity of the solution is 2.17 g/mL.
Definition of molarity
Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
molarity= mass÷ volume
Molarity is expressed in units mol/L.
This case
In this case, you have:
- mass of NH₃= 0.554 g
- molar mass of NH₃= 17 g/mole
- moles of NH₃= mass of NH₃÷ molar mass of NH₃= 0.0326 moles
- volume= 15 mL= 0.015 L (being 1000 mL= 1 L)
Replacing in the definition of molarity:
molarity= 0.0326 moles÷ 0.015 L
Solving:
molarity= 2.17 moles/L
Finally, the molarity of the solution is 2.17 g/mL.
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