The moles can be defined as the mass of the substance with respect to molar mass. The moles of potassium nitrate is 1 mol.
The moles of a compound can be calculated from:
[tex]\rm Moles=\dfrac{Mass}{Molar\;mass}[/tex]
The molarity can be defined as the moles of solute in a liter of solution.
The molarity can be expressed as:
[tex]\rm Molarity=\dfrac{Moles\;\times\;1000}{Volume\;(mL)}[/tex]
The molarity of potassium nitrate solution is 2 M, and the volume is 500 mL.
The moles of potassium nitrate is given as:
[tex]\rm 2\;M=\dfrac{Moles\;\times\;1000}{500\;mL}\\ Moles=\dfrac{2\;\times\;500}{1000}\;mol\\ Moles=1\;mol[/tex]
The moles of potassium nitrate in 2 M, 500 mL solution are 1 mol.
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