Respuesta :
The moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.
What is the definition of Molarity ?
It is defined as moles of solute in certain volume of Solvent.
The units of Molarity is mol/L or Molar(M)
Molarity = moles of solute / Volume of Solvent
It is given that a 2.5 L , 3.8 M solution
Let n be the number of moles needed
M = n/V
Substituting the values in the equation
3.8 = n /2.5
n = 3.8 * 2.5
n = 9.5 moles
Therefore the moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.
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