MOLAR MASS. WHAT IS MOLAR MASS?  Molar mass is the weight of one mole (or 6.02 x 10 23 molecules) of any chemical compounds. Molar masses of common chemical.

Slides:

Advertisements

Similar presentations

Molar Mass and Mole Calculation Problems

Advertisements

Unit 7: The Mole (Chapter 10). The Mole (Ch. 10) I. Chemical Measurements (10-1) A. Atomic Mass & Formula Mass A. Atomic Mass & Formula Mass 1. The mass.

60,200,000,000,000,000,000, x

Chemical Quantities.  Calculate the mass of compounds.  Calculate the volume of a given mass of a gas from its density at a given temperature and pressure.

Percentage Composition

Calculating Moles and Number of Atoms

Molar Mass Chemistry 11 Ms. McGrath. Molar Mass Molar mass (M) is the mass of one mole (6.02 x particles) of a substance numerically equal to the.

Chapter 7 Lecture Basic Chemistry Fourth Edition Chapter 7 Chemical Quantities 7.2 Molar Mass Learning Goal Given the chemical formula of a substance,

Molar Mass Sections 4-4 to 4-6. Carbon Atomic # is 6 Atomic mass is u Molar mass (mass per mole) is g/mole.

APPLICATIONS OF THE MOLE

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.

Review: Molar Mass of Compounds

Chapter 10: Chemical Quantities

Wednesday, March 19 th : “A” Day Thursday, March 20 th : “B” Day Agenda  Collect Homework: pg. 21/22 practice worksheet  Continue Section 7.1: “Avogadro’s.

The Mole Objective What is a MOLE???? An amount of a substance A unit of measurement specific to chemistry mole mol n.

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

Counting Large Quantities Many chemical calculations require counting atoms and molecules Many chemical calculations require counting atoms and molecules.

The Mole and Avogadro’s Number

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.

Molar Mass = mass in grams of one mole –Units grams/mole For elements, molar mass = atomic mass Why aren’t all atomic masses whole numbers? –Remember that.

Using the Mole. The Mole 1 mole = 6.02 X Particles Particle = atoms, compounds, or molecules Molar ratio: Tells us the number of moles of each chemical.

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

The mole (abbreviation: mol) is the amount of substance equal to 6.02 x particles These particles can be atoms, ions, formula units,molecules, electrons,

Moles Notes. 1. Atomic Mass Unit amu – atomic mass unit, used to describe the mass of an atom Conversion factor: 1 amu = 1.66 x g Equivalence statement:

Atoms and Molecules Formula Unit Mass The formula unit mass of a substance is a sum of the atomic masses of all atoms in a formula unit of a compound.

The Mole. Dimensional Analysis Review How many seconds are in 5.0 hours?

Wake-up 1.Study Polyatomic Ions for about 5/10 minutes. Write NO WAKE-UP on Friday.

IIIIIIIV Chapter 10 – Chemical Quantities What is the Mole? n A unit of measurement used in chemistry. n A counting number like – a dozen eggs, a ream.

Molar Mass & Percent Composition. The mass of 1 mole of an element or compound – The mass in grams from the Periodic Table Unit = grams per mole (g/mol)

Molar Mass.  A compound is a collection of bonded together. Ethanol, CH 3 CH 2 OH, is made up of : carbon atoms, hydrogen atoms, and oxygen atom, 2 6.

Quantities in Chemistry

Moles Part 2 – Mass in a Mole Aim CE4: What is the mass of a mole of water?

Today You will need a calculator! Go get it. Counting Atoms.

The MOLE! No, not the animal…Yes, this is chemistry.

Percent Composition Percent by mass of an element in a compound.

Chemical quantities Chapter Ways to measure matter Length/width/height Volume Density Surface Area Etc.

Compound Stoichiometry. The Mole Unit for dealing with the number of atoms, ions, or molecules in a common sized sample Relationship between Moles and.

Tro's Introductory Chemistry, Chapter Counting Atoms or Molecules by Moles The number of atoms or molecules we will use is x and we.

The Mole Learning Objectives: Explain the terms amount of substance, mole and the Avogadro constant. Define and use the term molar mass. Carry out calculations.

Molecular Weight, Percent Composition, Empirical Formula.

UNIT 5A Chapter 10: Chemical Quantities Molar Mass ABClark-Grubb.

Chapter 7 Lesson 1 Chemical Quantities. Counting Particles By Weighing If a person requests 500 quarter inch hexagonal nuts for purchase If a person requests.

Unit 5, Lesson 6 Measuring Concentration the Chemist’s Way: MOLARITY.

Objective: To reintroduce the mole and introduce two mole conversions Do Now: Solve each proportion = x2. 10 = x.

Isotope Practice sodium Na 11 protons, 11 electrons, 12 neutrons copper Cu 29 protons, 29 electrons, 35 neutrons silver Ag.

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.

Molar Mass Chemistry 11 Ms. McGrath. Molar Mass Molar mass (M) is the mass of one mole (6.02 x particles) of a substance numerically equal to the.

7.5 Molar Mass and Calculations

Section 2: Mass and the Mole

The Calculation of Formula Weight !!!

Atomic Mass is the Mass of One Mole of an Element

6.3/6.4 The Mole and Molar Mass

The Mole and Avogadro’s Number

Molar Mass Chemistry 11 Ms. McGrath.

EMPIRICAL FORMULA AND MOLECULAR FORMULA

CALCULATIONS USING THE MOLE (COMPOUNDS)

Formula Calculations (p )

Moles and Mass -The molar mass of a compound (aka molecular mass or molecular weight) is the sum of the atomic masses of each atom in the compound -Molar.

Molecular Weight and Molar Mass

Chapter 7 Chemical Quantities

1 step: Mol to mass conversions

Moles and Molar Masses.

QOTD What is atomic mass? How is atomic mass determined?

UNIT 5A Chapter 10: Chemical Quantities Molar Mass

Presentation transcript:

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 compounds that you might find in the chemistry laboratory can range between 18 grams/mole for compounds like water to hundreds of grams per mole for more complex chemical compounds.

CALCULATE THE MOLAR MASS OF AN ELEMENT:  The molar mass of elements is found by looking at the atomic mass of the element on the periodic table. For example, if you want to find the molar mass of carbon, you would find the atomic mass of carbon on the periodic table, and this is equal to the molar mass in grams per mole. So, in our example, carbon has a molar mass of grams per mole.  Exeptions: H2, N2, O2, F2, CL2, BR2, I2.  Meaning the element have two atoms and we need to multiply by two each o their atomic mass.

CALCULATE THE MOLAR MASS OF A CHEMICAL COMPOUND:  1. Molar masses of chemical compounds are equal to the sums of the molar masses of all the atoms in one molecule of that compound. If we have a chemical compound like NaCl, the molar mass will be equal to the molar mass of one atom of sodium plus the molar mass of one atom of chlorine. If we write this as a calculation, it looks like this:  (1 atom x 23 grams/mole Na) + (1 atom x 35.5 grams/mole Cl) = 58.5 grams/mole NaCl

 2. If you have a subscript in a chemical formula, then you multiply the number of atoms of anything next to that subscript by the number of the subscript. For most compounds, this is easy. For example, in iron (II) chloride, or FeCl 2, you have one atom of iron and two atoms of chlorine. The molar mass will be equal to (1 atom x 56 grams/mole Fe) + (2 atoms x 35.5 grams/mole of chlorine) = 127 grams/mole of iron (II) chloride.

EXAMPLES

Sodium Fluoride  In sodium fluoride, there is one atom of sodium and one atom of fluorine. The molar mass will then be: (1 atom x 23 grams/mole of sodium) + (1 atom x 19 grams/mole of fluorine) = 42 grams/mole of sodium fluoride

Copper (l) Chloride  In copper (I) chloride, there is one atom of copper and one atom of chlorine. The molar mass is then (1 x 63.5 grams) + (1 x 35.5 grams) = 99 grams/mole of copper (I) chloride

Calcium Fosfate  In calcium sulfate, there is one atom of calcium, one atom of sulfur, and four atoms of oxygen. The molar mass is then (1 x 40 grams) + (1 x 32 grams) + (4 x 16 grams) = 136 grams/mole of calcium sulfate

THANK YOU!!!