Question

How many moles of MgCl2 are present in 60.0 mL of 0.100 M MgCl2 solution

Answer 1

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.

Definition of molarity

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.

Number of moles of MgCl₂

In this case, you have:

• Molarity= 0.100 M
• number of moles of MgCl₂= ?
• volume= 60 mL= 0.06 L (being 1000 mL= 2 L)

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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