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There are a number of ways
to express concentration of a solution. This includes molarity. Molarity is
expressed as the number of moles of solute per volume of the solution. We calculate as follows:

0.105 mol / L (.0275 L ) = 0.003 mol NaCl

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Answer:

\(2.9.10^{-3}\) mol NaCl

Explanation:

we have the following data

27.5 mL= Volumen

\(1000 mL \longrightarrow 1 L\\ 27.5 mL \longrightarrow x\\\\x=\frac{27.5}{1000}\\ x= 0.0275 L\)

Molarity is defined as moles of solute per liter of solution

0.105 M =  Molarity

We know that there are 0.105 moles of NaCl per liter of solution

then how many moles of NaCl will be in 27.5 mL of solution

\(1 L \longrightarrow 0.105 mol NaCl\\27.5.10^{-3}L \longrightarrow x\\x=\frac{(27.5.10^{-3})(0.105)}{1}= 2.9 . 10^{-3}mol NaCl\)  

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