Monday, November 9, 2009

Density & Moles - Continued: Nov9 Class

Today in class, we drew out the flow chart for all the calculations we could do with this unit of moles. We did 3 examples and the last one is one made up.

Example: 1.25L of an unknown gas has a mass of 3.47g. What is the molar mass if it is at STP?
Example 2: A 5.00g sample of solid lead contains 0.247 mol of Pb. Calculate the density of Lead.

Example 3: 250mL of a gas which is known to contain one sulfur atom and an unknown number of fluorides has a mass of 1.63 g at STP
SFx
Step 1: Find the molar mass (g/mol)

Step 2: Find the chemical forumla


Example 4: A 8.00mL sample of (solid) Tin contains 0.632 mol of Sn. Calculate the density of Tin.


We spent the last 20-25 minutes of class, finishing questions #11-30 on the worksheet.
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1 comment:

  1. Mr. DoktorNovember 17, 2009 at 8:16 AM

    Good summary guys (and girls!) but all the examples look quite familar. I'm quite certain they are all the ones we did in class. Like I said earlier you should be creating some of your own examples.

    I'm glad to see that you guys are mostly current with all your postings.

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