Respuesta :

superman1987

Answer: 75.0 mL.

Explanation:

  • We have a rule says that "the number of millimoles before dilution is the same after dilution".
  • This rule can be expressed as (M1V1)before dilution = (M2V2)after dilution.
  • Before dilution: M1 = 2.0 M & V1 = ??? (The volume needed to be calculated)
  • After dilution: M2 = 1.0 M & V2 = 150.0 mL.
  • Now, the volume must be used from the stock to prepare the desired solution:
  • V1 before dilution = (M2V2)after dilution / (M1) = (1.0 M x 150.0 mL) / (2.0 M) = 75.0 mL.

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