Taking into account the definition of molarity, the number of moles of MgCl₂ present in 60.0 mL of 0.100 M MgCl₂ solution is 0.006 moles.
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:
molarity= number of moles of solute÷ volume
Molarity is expressed in units moles/L.
In this case, you have:
Replacing in the definition of molarity:
0.100 M=number of moles of MgCl₂÷ 0.06 L
Solving:
0.100 M × 0.06 L= number of moles of MgCl₂
0.006 moles= number of moles of MgCl₂
Finally, the number of moles of MgCl₂ is 0.006 moles.
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