Question

What volume of ethanol must be diluted with
water to prepare 674 mL of 0.854 M solution?
The density of ethanol is given as 0.789 g/mL.
Answer in units of mL

Answer 1

You need a total volume of 674mL=0.674L


Solve for moles of ethanol:

Moles=Molarity*Volume (L)

Moles=0.854 M*0.674L

Moles of ethanol*(46.07g/mole)= mass of ethanol

Density=Mass/Volume

So,

Mass/Density=Volume (mL)

Mass of ethanol/0.789 g/mL=Volume (mL)