Percent Composition, Empirical Formulas, and Molecular Formulas

Slides:

Advertisements

Similar presentations

Section Percent Composition and Chemical Formulas

Advertisements

Chapter 7 – The Mole and Chemical Composition

Determining Chemical Formulas Experimentally % composition, empirical and molecular formula.

Percentage Composition

Mass Conservation in Chemical Reactions Mass and atoms are conserved in every chemical reaction. Molecules, formula units, moles and volumes are not always.

Empirical Formula The empirical formula indicates the ratio of the atoms of an element in a compound.

Bring your calculators to class. Remember the mole? (not just a furry animal that digs holes in the yard.) unit used by chemist to measure things. 1 mole.

Chemical Quantities Chapter 10:The Mole

WHAT IS A MOLE?.

Chapter 10 review.

Moles and Stoichiometry Chapters 11 & 12. Counting Particles Particles are counted in moles Types of representative particles Atoms- smallest unit of.

IIIIII II. Formula Calculations Ch. 10 – The Mole.

IIIIII C. Johannesson III. Formula Calculations (p ) Ch. 3 & 7 – The Mole.

IIIIII Suggested Reading: Pages Chapter 7 sec 3 & 4.

Aim: How to determine Empirical and Molecular Formula DO NOW: Here is data from an experiment: 1.Mass of empty crucible + cover = g 2.Mass of crucible.

THE MOLE. Atomic and molecular mass Masses of atoms, molecules, and formula units are given in amu (atomic mass units). Example: Sodium chloride: (22.99.

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)

1 Chapter 10 “Chemical Quantities” Yes, you will need a calculator for this chapter!

Molecular Formula Represents the actual number of atoms of each element in compound – Not necessary for ionic compounds – Necessary for covalent compounds.

WHAT IS A MOLE?. Moles: Measuring Matter A UNIT OF MEASURE!!! 1 mole = 6.02 x representative particles – atoms, molecules, formula units, ions –

Percent Composition and Molecular Formulas.  Determining the percent composition of each element in a compound  H 2 O 1. Find the molar mass of the.

Unit Empirical and Molecular Formulas. Empirical Formulas Consists of the symbols for the elements combined in a compound, with subscripts showing.

IIIIII III. Formula Calculations (p ) Ch. 3 & 7 – The Mole.

Empirical Formula vs. Molecular Formula Empirical formula: the formula for a compound with the smallest whole-number mole ratio of the elements Molecular.

The Formula for a Hydrate Objectives: 6.0 Solve stoichiometric problems involving relationships among the number of particles, moles, and masses of reactants.

IIIIII Formula Calculations The Mole. A. Percentage Composition n the percentage by mass of each element in a compound.

Empirical & Molecular Formulas. Percent Composition Def – the percent by mass of each element in a compound Percent by mass = mass of element x 100 mass.

Topic 3 The Mathematics of Formulas and Equations

10-3: Empirical and Molecular Formulas. Percentage Composition The mass of each element in a compound, compared to the mass of the entire compound (multiplied.

Aim: How to determine Empirical and Molecular Formula DO NOW: Copy the question. Here is data from an experiment: 1.Mass of empty crucible + cover =

RR: Write generic equations to convert: mass  moles, particles  moles, & mass  particles.

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

C. Johannesson Ch. 11 – The Mole Molar Conversions & Calculations.

Chemical Formulas. Mass Percent Also known as percent composition. Shows the mass of each element in a compound as a percent of the total mass of the.

IIIIII II. % Composition and Formula Calculations Ch. 3 – The Mole.

Percent Composition Determine the mass percentage of each element in the compound. Determine the mass percentage of each element in the compound. Mass.

Warm-up March 22nd 9.67 moles of KCl = __________________ grams KCl

III. Formula Calculations (p )

THE MOLE Formula Calculations.

Percentage Composition from Formulas

Molar Conversions & Calculations

III. Formula Calculations (p )

Formula Calculations (p )

The Mole Formula Calculations.

III. Formula Calculations

EMPIRICAL FORMULA The empirical formula represents the smallest ratio of atoms present in a compound. The molecular formula gives the total number of atoms.

Chemical Quantities.

III. Formula Calculations (p )

III. Formula Calculations (p )

Section 3.2 Stoichiometry and Compound Formulas

Empirical formula – the chemical formula of a compound written using the smallest, whole number, mole ratio between atoms in the compound. What is the.

The Mole -just as a _____ is always ____, a _______ is always _______,

Percent Composition Empirical Formula Molecular Formula

II. Percent composition

III. Formula Calculations

Moles and Formula Mass.

Empirical Formulas Unit 5.

II. Percent composition

III. Formula Calculations (p )

Vocabulary Percent Composition -

Chemical Composition Mole (mol) – The number equal to the number of carbon atoms in grams of carbon. Avogadro’s number – The number of atoms in exactly.

Using Chemical Formulas

Unit 9: Covalent Bonding

Chemical Calculations

Empirical and Molecular Formulas

III. Formula Calculations (p )

Ch. 10– The Mole Formula Calculations.

Molecular Formula.

Chemical Formulas Tell type & number atoms in compound

Presentation transcript:

Percent Composition, Empirical Formulas, and Molecular Formulas

Percent Composition percent composition: the percentage by mass of each element in a compound Part _______ Percent = x 100% Whole % element = mass of element in compound __________________________ mass of compound x 100%

Percent Composition Example % element = mass of element in compound __________________________ mass of compound x 100% What is the percent composition of the element carbon in CH3COOH?

Percent Composition Example % element = mass of element in compound __________________________ mass of compound x 100% What is the percent composition of each element in calcium chloride?

Empirical Formulas Molecular Formula: chemical formulas that indicate the actual numbers and types of atoms in a molecule Empirical Formula: chemical formulas that give only the relative number of atoms the “simplified/reduced form” of the formula *Often the same!

Empirical Formula Example Remember: A chemical formula tells us the number of MOLES of each element – you MUST convert grams to moles!!! Example: A compound contains 63.57 g Fe and 36.43 g O. What is its empirical formula?

Empirical Formula Example Remember: A chemical formula tells us the number of MOLES of each element – you MUST convert grams to moles!!! Example: What is the empirical formula for a compound with 18.8% nickel and 81.2% iodine?

Hydrates Hydrate: a chemical compound that contains water as part of its structure

Hydrate Example You perform an experiment to determine the molecular formula of a nickel sulfate hydrate, NiSO4•xH2O. The mass of the hydrate before heating is 3.00 g. The mass of the anhydrous compound after heating is 1.76 g. What is the molecular formula of the hydrate?