01/06/11.

Slides:

Advertisements

Similar presentations

Calculating Empirical and Molecular Formulas

Advertisements

Section Percent Composition and Chemical Formulas

Chem Catalyst 1) How many grams does 3.24 mol of carbon weigh? 2) How many particles are in 3.24 mol of carbon dioxide?

Ch 100: Fundamentals for Chemistry

Chapter 7 – The Mole and Chemical Composition

Chemistry Notes Empirical & Molecular Formulas. Empirical Formula The empirical formula gives you the lowest, whole number ratio of elements in the compound.

Notes #18 Section Assessment The percent by mass of an element in a compound is the number of grams of the element divided by the mass in grams.

Percent Composition and Empirical Formulas Ch

Percent Composition Empirical Formulas and Molecular Formulas Quantification in Chemistry.

Percentage Composition

MOLAR MASS. WHAT IS MOLAR MASS?  Molar mass is the weight of one mole (or 6.02 x molecules) of any chemical compounds. Molar masses of common chemical.

Molar Mass & Percent Composition

01/06/11. What is the Molar Mass of the following: Calcium Sodium Oxygen TURN AND TALK Chat with your neighbors about the following questions? What.

Calculating Percent Composition Mrs. Page 10 th Chemistry.

Percent Composition. What is Percent Composition?  The percent composition by mass of a compound represents the percent that each element in a compound.

Section 3: Moles of Compounds Chemical Composition.

Chemical Formulas and Molar Masses A few old ideas revisited and a few new.

Chemical Formulas and Molar Masses A few old ideas revisited and a few new.

Sec. 10.4: Empirical & Molecular Formulas

Jeopardy Molar Mass Avogadro’s Number Stoichiometry Limiting Reactant Emp/Molec Formula Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $200 Q $300 Q $400.

The Mole AA. Review Must turn in your packet with notes stapled to it before you can take the test.

Percent Composition (Section 11.4) Helps determine identity of unknown compound –Think CSI—they use a mass spectrometer Percent by mass of each element.

Types of Chemical Reactions. Synthesis Reactions Reactants  Products 2Li (s) + F 2(g)  2LiF (s)

Section 4: Moles of Compounds

Chemical Formulas and Moles. Example: 1.water (C) – every molecule of water contains 2 atoms of hydrogen & one atom of oxygen - 2 molecules of H 2 O would.

Counting Atoms Chapter 9. MOLE?? Moles of Particles In one mole of a substance, there are 6 x particles.

Percent Composition Parts of a Whole. Percent Short for per centum …”by the hundred” Part of a whole If there are 10 people in a room and 4 of them have.

Section 7.3 Percent Composition of a Compound Here’s were the math starts to get fun!!!

Molar Mass Practice: Molar Mass Practice: 1. Find the molar mass of ammonium sulfate (also called the formula mass): 2. Find the molar mass of copper (II)

 How many atoms are in 3.6 mol of calcium?  How many moles are in 1.45 x atoms of sodium?  What is the molar mass of K 2 SO 4 ?  How many grams.

Review for chapter 8 Problem-solving practice. Calculating masses 1) Calculate the molecular mass of pentane 2) Calculate the formula mass of calcium.

Percent Composition and Empirical Formula

Percent Composition. What is it? The percent composition by mass of a compound represents the percent that each element in a compound contributes to the.

Chapter 7 Reactions. Chemical Changes Substances react and form a new substance. Reactants go in. Products come out. Reactants Products Represented by.

Percentage Composition

Percent Composition. Chemistry Joke Q: What do you get when you chop an avocado up into 6.02 x pieces? A: Guaca -- mole!

Empirical & Molecular Formulas. Percent Composition Determine the elements present in a compound and their percent by mass. A 100g sample of a new compound.

PERCENT COMPOSITION. The first step in finding percent composition is to find the molar mass of the compound that you are to prepare. Let's look at an.

Unit 9: Covalent Bonding Chapters 8 & 9 Chemistry 1K Cypress Creek High School.

Percentage composition Indicates the relative amount of each element present in a compound.

Types of Chemical Reactions. Synthesis Reactions Reactants  Products 2Li (s) + F 2(g)  2LiF (s)

The Mole.  Matter can be measured in 3 ways:  Counting particles  Mass  Volume.

Empirical Formulas from Percents and Mass. Empirical Formula Definition: A formula that shows the simplest whole-number ratio of the atoms in a compound.

Molecular Weight, Percent Composition, Empirical Formula.

Percent Composition What is the % mass composition (in grams) of the green markers compared to the all of the markers? % green markers = grams of green.

Warm-up Determine the molar mass of the following compounds: Magnesium sulfide Potassium fluoride Carbon tetrabromide Dinitrogen hexachloride.

Empirical Formulae The empirical formula of a compound is the simplest ratio of the different atoms in it. For example, for ethane (C2H6)it is CH3. You.

Percent Composition. What is it? Percent composition is the percent by mass of each element present in a compound.

Moles and Molarity. I CAN calculate MOLES and MOLARITY from Formula Weight (FW) data.

ATOMIC MASS – The mass of an individual atom ATOMIC MASS UNIT (amu or u) – One twelfth the mass of a carbon-12 atom, equal to 1.66 x g Atomic masses.

Chapter 7 Moles. What is a Representative Particle The smallest unit into which a substance can be broken down without changing the composition of the.

Atoms Combine in a Constant Ratio to make Compounds

Percentage Composition from Formulas

PERCENT COMPOSITION CHAPTER 7-3.

Percent Composition Calculations

EMPIRICAL FORMULA AND MOLECULAR FORMULA

– the percent by mass of each element in a compound.

Calculating Empirical and Molecular Formulas

Chapter 7 Reactions.

Chemical Formulas.

Writing Chemical Equations

Percent Composition.

Empirical & Molecular Formulas

Empirical and Molecular Formulas

Chapter 8 Chemistry 1L Cypress Creek High School

Percent Composition.

PERCENT COMPOSITION used to determine the formula of a compound

Notes Ch. 10.3a Calculating Percent Composition

Write the formulas that go with the following names:

Presentation transcript:

01/06/11

TURN AND TALK Chat with your neighbors about the following questions? What is MOLAR MASS? What is the Molar Mass of the following: Calcium Sodium Oxygen

Molar Mass of a Compound What is the Molar Mass of the following simple compounds: Sodium Chloride Lithium Bromide Magnesium Oxide

Practice Problem Extension Carbon dioxide – write the formula, calculate molar mass. Q1. How many moles of carbon dioxide are in 120.g? Think about how you convert mass to moles…

Practice Problem Extension Ammonium sulfite – write the formula, calculate molar mass Q2. How many moles of ammonium sulfite are in 2.50g?

Percent Composition Chemical Compounds Percent composition refers to the percent by mass of an element or compound within a larger compound. To find it, you need the total molar mass of the compound. And the molar mass of the element (part) that you are finding the percent composition

Percent Composition Chemical Compounds Percent composition refers to the percent by mass of an element or compound within a larger compound. Practice: Percent Composition of sodium in sodium chloride Molar Mass of Na= Cl= Molar Mass NaCl = %Na = To find it, you need the total molar mass of the compound. And the molar mass of the element (part) that you are finding the percent composition Then divide the molar mass of unknown part by the total molar mass and multiply by 100 to get your answer

Percent Composition Chemical Compounds Practice: Percent Composition of magnesium in magnesium oxide Molar Mass of Mg= O= Molar Mass MgO = %Mg =

Practice Problem Extension Dinitrogen pentoxide – write the formula, calculate molar mass Q4. What is the percent composition of nitrogen in dinitrogen pentoxide?

Practice Problem Extension Calcium acetate – write the formula, calculate molar mass Q5. What is the percent composition of calcium in calcium acetate? Can you figure out how many grams of calcium are in 50g of calcium acetate?