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What volume of methanol should be used to make 1.25 L of a 21.0% by volume solution?
___ mL

Respuesta :

Answer:

V CH3OH = 262.5 mL

Explanation:

  • %v/v = (v compound / v sln)×100

∴ %v/v = 21.0 %

∴ v sln = 1.25 L

⇒ v compound = ?

⇒ 21.0 % = ( v compound / 1.25)×100

⇒ 0.21 = v compound / 1.25 L

⇒ (0.21)*(1.25 L) = v compound

⇒ v compound = 0.2625 L = 262.5 mL

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