# Lesson #3 – Molar Mass of a Compound - PowerPoint PPT Presentation

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Let’s take up the tests! Important info for re-writes: Wednesday at 3:30-5:30pm Extra 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 ________________

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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!

### 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!!