Question

Question #edd2c

Answer 1

The answer is `25mL`.

I've done a little research and discovered that, for mannitol (a sugar alcohol derived from the sugar manose by reduction) solutions, the concentration is usually w/v.

A w/v solution is used when a substance is mixed as a dry mass (grams) per mL (volume):

`"w/v%" = (mass)/(volume) * 100%`

So, a 20% w/v solution would have 20.0 g of mannitol for every 100 mL of solution -> 20g/100mL . Therefore, the volume needed for 5.0 g of mannitol is

`"w/v%" = (mass)/(volume) * 100 -> volume = (mass * 100)/("w/v%")`

`volume = (5.0 * 100)/((20"g/100mL")) = 25mL`