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# Chapter 10 note taking guide

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### Chapter 10 note taking guide

1. 1. Chapter 10 Notes—ALL ABOUT THE MOLE! How do I calculate molar mass? STEP 1: STEP 2: STEP 3: STEP 4: What is a mole? TRY IT OUT! Find the molar masses of: NaCl H2 O SO3 PCl3 MOLAR MASS!
2. 2. EVERYTHING GOES THROUGH THE MOLE! WHAT IS A TWO-STEP CONVERSION PROBLEM? Calculate the number of molecules in 60.0 g NO2. 1st Conversion: 2nd Conversion: So here’s an example! Here’s the equation:
3. 3. How many moles is 2.80 X 1024 atoms of silicon? How many moles is 2.17 X 1023 particles of bromine? How many moles are in 20 grams of NaCl? Determine the volume in liters of 5 moles of hydrogen gas. Another example: Calculate the volume, in liters, of 3.24 x 1022 molecules of Cl2 (STP). LET’S PRACTICE!
4. 4. Calculating Percent Composition Step 1: Step 2: Step 3: Step 4: Let’s Practice: What is the percent composition of PbCO 4 ? • When no formula is given, take the numbers that are given and add them together to get a total. • Divide each number by the total and multiply by 100 to get the percent. EMPIRICAL FORMULA • What is an empirical formula?
5. 5. • This is a formula that gives the lowest whole number ratio of atoms in a compound. • It’s similar to reducing fractions. Calculating Empirical Formula Step 1: Step 2: Step 3: Step 4: Step 5:
6. 6. Let’s Practice: A compound is analyzed and found to contain 13.5 g Ca, 10.8 g O and .675 g H. What is the empirical formula of the compound? Molecular Formula • Molecular formula is similar to empirical formula. • It is a multiple of the empirical formula and reflects the actual chemical formula. Step 1: Step 2: Step 3: Step 4:
7. 7. Let’s Practice! A compound with the empirical formula of C2OH4 has a molar mass of 88 grams per mole. What is its molecular formula? Hint: the empirical formula has already been calculated for you. Topics on the test: *Calculate molar mass *Convert Moles, liters, grams and molecules/atoms using mole road. *Calculate percent composition *Calculate empirical formula *Calculate molecular formula