How to convert ml to moles? ex: I have 20 ml of CaCl2

Question

aaronq · Answer

20 mL of liquid CaCl2 or a solution of CaCl2 ?

dtan5457 · Answer

@dg98 

Could you clarify aaron's question?

anonymous · Answer

um, well it was in liquid form i guess

anonymous · Answer

i'm not sure what the difference is--we did an experiment in class

dtan5457 · Answer

If it's a pure liquid..

you need to get the density of the compound first.

anonymous · Answer

how do you know which one it is, liquid of solution?

dtan5457 · Answer

using google, I got 2.15 g/cm

now multiply that by the given mass=

20ml x 2.15=43 grams

now get the formula mass of cacl2

43/formula mass=# of moles

anonymous · Answer

oh okay thanks! if it were a solution, would the result have been different? & how would you tell the difference between liquid and solution??

dtan5457 · Answer

Read this http://socratic.org/questions/how-do-you-calculate-the-number-of-moles-from-volume from the info given in your question, I don't think its enough to solve as a solution.

anonymous · Answer

oh, your link kind of confuses me. because this is the info i was given (idk what to use): CaCl2 has 20 ml and 1 mol, meanwhile we also have 0.5 mol of 30 ml of Na2CO3 and were asked to find limiting reagent. would your calculation be right for this?

aaronq · Answer

are you sure it doesnt say 20 mL of $\sf 1~ M$? 

capital "$M$" is a concentration unit that means "$mol/L$"

anonymous · Answer

oh that would make a lot more sense..! let me quickly check~