Taking into account the definition of molarity, the molar concentration of 5.8501 g NaCl dissolved in 500.00 cm³ volumetric flask is 0.2 mol/L.
<h3>Definition of molarity</h3>
Molarity is a measure of concentration that indicates the number of moles of solute that are dissolved in one liter of solution. This is, the molarity indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated according to the following expression:
molarity= number of moles of solute÷ volume
Molarity is expressed in units moles/L.
<h3>Molar concentration of NaCl</h3>
In this case, you have:
- mass of NaCl= 5.8501 g
- molar mass of NaCl= 58.45 g/mole
- number of moles of NaCl= mass of NaCl÷ molar mass of NaCl= 0.1 moles
- volume= 500 cm³= 0.5 L (1 cm³= 0.001 L)
Replacing in the definition of molarity:
molarity= 0.1 moles÷ 0.5 L
Solving:
<u><em>molarity= 0.2 mol/L</em></u>
Finally, the molar concentration is 0.2 mol/L.
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