Millimoles and fluid volume

[Ossi]

hello

i am trying to figure out a 2nd year fluid calculation assignment. i am not trying to cheat my way around but having geniune problem understanding how to approach the problem.

assignment:

"patient is given glucosteril 30% 500ml + kcl 80mmol + nacl 120mmol + tracefusin 10ml /in 12h. calculate his fluid intake volume per hour."

it is trivial to calculate volume amounts of glucosteril and trancefusin (just divide their milliliter amounts by 12). but how in the hell should i calculate fluid volume of potassium chloride and sodium chloride? the given unit (mmol, millimole or meq for you americans) is a measurement unit of relative strength. to be more exact, effective particles per million.

my approach for this problem was to find a real-life example of package that potassium chloride is delivered to the hospital and use that as base. one package example of potassium chloride can be found from dailymed.gov. the packaging information was following (only last item displayed here as the forum breaks tables).

 [b][color=white]additive solution* [/b][b][color=white](conc.& size) : [/b][b][b]40 meq/20 ml[/b][/b][b][color=white][/b] [b][color=white]k+ [/b][b][color=white]meq/ml : 2[/b][b][color=white]kcl [/b][b][color=white]mg/ml : 149[/b][b][color=white]mosmol/ml [/b][b][color=white](calc.) : 4[/b]

from this table i selected the last item and used it as calculation base:

- prescribed amount was 80 mmol per 12 hour, so i need 160 ml for 24 hours. that can be gotten by using 4 x "40 meq/20 ml". and therefore the volume per hour is 3.33 milliliters per hour.

however the teacher keeps telling me that this is not the right solution.

how would you approach this problem?