[MissDee]

I have a very dummy question pertaining to my chemistry lab.
I need to find the moles of I₂ added to a vitamin C sample.

I'm aware the formula for finding moles is: moles = mass (g)/molar mass

However, how am I suppose to find moles from a liquid? Do I convert the mL of liquid to grams and solve for moles that way?

For example, I added 30mL of I₂ to an unknown sample containing vitamin C until it was neutralized.

1mL = 1g for pure water at a specific temperature. However, I₂ is obviously not pure water.

I'm a little lost here. Someone please walk me through this? Even a formula would help me a lot!

[Borek]

You need to know concentration.

http://www.titrations.info/titration-calculation

[MissDee]

Thank you for the link. However, I'm still a little confused.

If I need to find concentration, when C = n/V.. I still do not have n (moles)?

[Borek]

You can't calculate concentration, you need it as a given. It is not possible to solve the question from the information you have listed.

[zeshkani]

use molarity to find the the moles
you have a stoichiometry problem

write it you, you can solve it easy then , since you know the all the other info

[Borek]

use molarity to find the the moles

Molarity is not given, or at least not listed. Giving bad advice is worse than giving no advice at all.

[zeshkani]

He/she is given something, its his/her bad by not listing all of the information

use molarity to find the the moles

Molarity is not given, or at least not listed. Giving bad advice is worse than giving no advice at all.

[MissDee]

You're right - I needed the molarity to find moles.

I did not realize I needed to calculate molarity at first. They asked for moles first then molarity later, when I needed molarity first to find the moles.

Thanks and sorry for the confusion. 

He/she is given something, its his/her bad by not listing all of the information

use molarity to find the the moles

Molarity is not given, or at least not listed. Giving bad advice is worse than giving no advice at all.