Someone please help me? I turned in this lab assignment and got a 15/35. I really need help and my teacher is on break this weekend so I can't call her for help. I don't understand what I did wrong.

Question

aripotta · Answer

here is the lab i turned in and my teacher's "feedback"

wolfe8 · Answer

I think her explanations are quite detailed. What don't you understand?

aripotta · Answer

i think i did exactly what she wrote except for #2 and i don't know why she's using those conversions. like why is it .5 mol??

wolfe8 · Answer

If I understand correctly, 0.5 is the molarity. And to find the number of mole, you multiply the molarity with volume.

aripotta · Answer

i'm so confused

aripotta · Answer

that wasn't in the lesson

aripotta · Answer

alright wait. how did she get .5 as the molarity then?

aripotta · Answer

oh nvm

aripotta · Answer

i think i understand now. wow ok i feel really stupid. thank you for your help

wolfe8 · Answer

It is in the question. Also, you will need this formula: n=mV where n is the number of mole, m is the molarity in mol/L, and V is the volume in liters. 

You're welcome.

wolfe8 · Answer

And no you are not stupid. Everyone makes mistakes like this. Just keep trying and all the best.

aripotta · Answer

so it's 0.505 mol right?

wolfe8 · Answer

I'm sorry I closed it all. But if you use the formula correctly using the right units, it should be right.

aripotta · Answer

ok thanks again :]

wolfe8 · Answer

You're welcome.