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Lesson #3 – Molar Mass of a CompoundPowerPoint Presentation

Lesson #3 – Molar Mass of a Compound

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### Let’s take up the tests!Important info for re-writes: Wednesday at 3:30-5:30pmExtra help? Availability?

Lesson #3 – Molar Mass of a Compound

- To find the molar mass of a compound, we need to look at ____________________
- The molar mass ________________
- ___________________________________molecule or formula unit of that compound.
- Similar to balancing equations; you will have to take into consideration how many atoms of each element in a compound by ______________________________________

Sample Problem #1

- What is the molar mass of magnesium carbonate?

Sample Problem #2

- What is the molar mass of calcium phosphate?

Sample Problem #3

- How many grams are in 5.4 moles of H2O?

Sample Problem #4

- Convert 657g CuSO4 to moles

Homework!

- Exercise 3, pg. 13 of the green book!
- Really helpful exercise visually and practice doing calculations!

Lesson #4 – Moles, Grams, and Particles

- Let’s put it all together!

The Magic Triangle!Relationship

The Magic TriangleCalculations

Sample Problem #1

- Convert 2.40 x 1024 molecules of N2 to grams

Sample Problem #2

- A spoonful of sugar, C12H22O11, has a mass of 10g. Calculate the number of molecules in a spoonful of sugar.

Sample Problem #3

- To check for blockages in the digestive tract, a drink of barium sulfate is given to patients before an X-ray. X-rays can not pass through barium sulfate, it’s presence would appear on the X-ray film and a blockage would be apparent. If 0.500 mole of barium sulfate is needed, how many grams of barium sulfate will be given to the patient?

Homework!

- The rest of the questions on pg. 15 and the questions from the text!!
- Lab on Wednesday!!
- Re-writes are here before the lab!
- See you then!!

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