Calculation of Molecular Formula

Slides:

Advertisements

Similar presentations

Chapter 11 Empirical and Molecular Formulas

Advertisements

Empirical and Molecular Formulas Empirical and Molecular Formulas An empirical formula shows the simplest whole number ratio of atoms of each element.

1 Empirical Formulas Honors Chemistry. 2 Formulas The empirical formula for C 3 H 15 N 3 is CH 5 N. The empirical formula for C 3 H 15 N 3 is CH 5 N.

MOLECULAR FORMULAS (here you will be using empirical to help you determine molecular formulas)

Molecular and Empirical Formulas Percentage Composition: Mass of each element compared to the mass of the compound ( m / m ) or volume of each compared.

Calculating Percent Yield Chapter 10.3 Intro to Percent Composition The number of percent values in the percent in the percent composition of a compounds.

Empirical and Molecular Formulas. Empirical Formula What are we talking about??? Empirical Formula represents the smallest ratio of atoms in a formula.

Unit 6: Chemical Quantities

Empirical Formula Calculations Problem: A compound is found to contain the following % by mass: 69.58% Ba 6.090% C 24.32% O What is the empirical formula?

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.

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

Empirical Formulas. Gives the lowest whole-number ratio of the elements in a compound. Example: Hydrogen Peroxide (H 2 O 2 ) Empirical Formula- HO.

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.

Section 12.2: Using Moles (part 3). Mass Percent Steps: 1) Calculate mass of each element 2) Calculate total mass 3) Divide mass of element/ mass of compound.

Starter  Finish the study guide from yesterday. Ch. 7B Using Chemical Formulas 7B.4 Determining Molecular Formulas.

USING MOLAR CONVERSIONS TO DETERMINE EMPIRICAL AND MOLECULAR FORMULAS.

(4.6/4.7) Empirical and Molecular Formulas SCH 3U.

Formulas Ethane Formula C 2 H 6 Why don’t we simplify it? CH 3 StructureH | H ---- C ---- C ---- H | H.

% Composition, Empirical Formulas, & Molecular Formulas Chapter 9 sections 3 & 4.

IIIIII Molecular Formula Notes The Mole. C. Molecular Formula n “True Formula” - the actual number of atoms in a compound CH 3 C2H6C2H6 empirical formula.

Helpful hints to solve molecular formula, empirical formula, and percent composition problems.

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

Unit 8 Stoichiometry Molecular Formulas Page 65 CH2O C6H12O6.

Empirical Formula: Smallest ratio of atoms of all elements in a compound Molecular Formula: Actual numbers of atoms of each element in a compound Determined.

Determining the Empirical Formula for a Compound

III. Formula Calculations (p )

6.7 Empirical Formula and 6.8 Molecular Formulas

Calculating Empirical Formulas

Empirical Formula.

Percentage Composition from Formulas

Chapter 7 Chemical Quantities

EMPIRICAL FORMULA VS. MOLECULAR FORMULA .

% Composition & Empirical Formulas

Empirical and Molecular Formulas

III. Formula Calculations (p )

Percent Composition & Empirical and Molecular Formulas

The Mole Formula Calculations.

Empirical Formulas a formula that represents the simplest ratio among the elements of a compound.

Empirical Formulas.

Empirical & Molecular Formulas

Empirical Formula Molecular Formula

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

III. Formula Calculations (p )

III. Formula Calculations (p )

Ch. 8 – The Mole Empirical formula.

Empirical and Molecular Formulas

Empirical and Molecular Formulas

Empirical and Molecular Formulas

DO NOW Pick up notes Get out homework, calculator, and periodic table.

Determining Empirical and Molecular Formulas

III. Formula Calculations

TYPES OF FORMULA.

Empirical and Molecular Formulas

Empirical Formulas Unit 5.

Ch. 8 – The Mole Empirical formula.

III. Formula Calculations (p )

% Composition, Empirical Formulas, & Molecular Formulas

% Composition, Empirical Formulas, & Molecular Formulas

Empirical and Molecular Formulas

Calculating Empirical and Molecular Formulas

Chapter 7 Chemical Quantities

C2H6 CH3 B. Empirical Formula

III. Formula Calculations (p )

Calculating Empirical and Molecular Formulas

Empirical and Molecular Formulae

From percentage to formula

Molecular Formula.

Molecular Formula Acetic Acid Glucose Formaldehyde.

Empirical Formulas, Hydrates, and Molecular Formulas

Presentation transcript:

Calculation of Molecular Formula May/Caiafa Calculation of Molecular Formula May/Caiafa’06 This calculation uses the molecular mass and the empirical formula for a compound. Determine the empirical mass. Divide the molecular mass by the empirical mass. After this division you will have a number that: Is the ratio of the molecular to empirical formula; for example if the # is 2 then the molecular formula would be double the empirical formula. Will be multiplied by the subscripts of the empirical formula to get the true or molecular formula Multiply all of the subscripts by the whole number from step 2.

Calculation of Molecular Formula May/Caiafa Calculation of Molecular Formula A compound has an empirical formula of C4H4O and a molar mass of 136 grams per mole. What is the molecular formula. Empirical Mass C4H4O = 4(12.01) + 4(1.008) + 16.00 = 68.07 136/68.07 = 2 Ratio of molecular to empirical C4x2 H4x2 O1x2 = C8 H8 O2 Molecular Formula