Insert Mole Title Here

So first off, I'd like to congratulate Kaitlyn on a wondeful posting job.
Now for class, we had kind of a work day in store for us. We got more practice with moles so we could better understand what it is and also we got more practice with unit conversion.
First off, we went to our notes and finished two "Learning Check!". First problem we had was:
Question: How many atoms of K are present in 78.4 g of K?
Work: Take the amount (78.4 g), multiply it by (1 mole of K over 39 (molar mass) grams of K), then multiply that by (Avogadro's number (6.02 times 10^23) over 1 mole of K).
Answer: 1.21 times 10^24.

Our second Learning Check! was:
Question: What is the mass (in grams) of 1.20 X 10^24 molecules of glucose (C6H12O6)?
So this question is actually working the opposite way of our other problem. We've got to find the mass (instead of molecules) and we start with the molecules (instead of the mass).
Work: 1.20 X 10^24 times (1 mole of glucose divided by Avogadro's number) times (the Molar mass divided by 1 mole of glucose).
To find the molar mass for this problem, we must take all the subscripts, multiply them by the mass of their individual atomic masses, then add all of those together. In this problem, the molar mass would be:
6 (subscript of Carbon) X 12 (atomic mass of Carbon) + 12 (hydrogen) X 1 + 6(oxygen) X 16 = 180 grams
Once we plug in the molar mass, our answer should be 359 grams per mole.

So, in order to really understand how we got this, you must already know about moles and molar mass. If you do not understand these fully, please either look back at your notes (you can find extras in moodle), or just look below at Kaitlyn's post.

After we finished those two problems, we had the rest of the period to work on our mole workshop. This compromised of 5 questions all of which we should have done by tomorrow with our partner. An extra copy of this worksheet can also be found in moodle under unit three worksheets (unfortunately the answers are not there).

Homework: Finish the Mole Workshop as well as the second mole worksheet. Both were given out before class.
Important dates: 10/20 (tomorrow!) review quiz on unit conversion and moles.
10/28 Unit exam, remember to have your homework problems done

Random fact of the day: Black whales are born white.
Also, I'd like to point out we had our first visitor from Japan.

Next Scribe will be Elim J