Empirical Formula. Definition A formula that shows the simplest whole-number ratio of the atoms in a compound Ex: H 2 O Not an Ex: H 4 O 2.

Slides:

Advertisements

Similar presentations

C.10: Empirical and Molecular Formulas

Advertisements

Empirical and Molecular Formulas

GRAB A CALCULATOR AND GET OUT A PIECE OF PAPER FOR NOTES. Empirical Formulas.

Molecular Formulas Chemistry

© 2014 Pearson Education, Inc. Chapter 7 Lecture Basic Chemistry Fourth Edition Chapter 7 Chemical Quantities 7.4 Mass Percent Composition and Empirical.

Calculating Empirical and Molecular Formulas

Section 5: Empirical and Molecular Formulas

Percent Composition, Empirical, and Molecular Formulas

Percent Composition and Empirical Formulas

Empirical: based on observation and experiment

Empirical and Molecular Formulas

Percent Composition and Empirical Formulas Ch

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

Percent Composition Empirical Formulas and Molecular Formulas Quantification in Chemistry.

Percentage Composition

The Mole & Chemical Formulas A chemical formula represents the ratio of atoms that always exists for that compound Example: Water – H 2 O Always 2 H atoms.

Empirical and Molecular Formulas

Percent Composition, Empirical Formula and Molecular Formula 10.4 summary.

Molar Mass & Percent Composition

  Proportion or ratio of each element in a chemical compound  Expressed as grams of element per 100 grams of chemical compound What is percent composition?

Empirical and Molecular Formulas How to find out what an unknown compound is.

4.6 MOLECULAR FORMULAS. 1. Determine the percent composition of all elements. 2. Convert this information into an empirical formula 3. Find the true number.

Quantitative Chemistry Part 2

Chem Catalyst Calculate the percent composition of ibuprofen (C13H18O2)

The Mole and Chemical Composition

The Mole and Chemical Composition

Monday, April 21 st : “A” Day Tuesday, April 22 nd : “B” Day Agenda  Go over Sec. 7.2 quiz  Begin 7.3: “Formulas & Percentage Composition”  In-Class.

Chapter 7 Chemical Quantities. The Mole (Friend or foe)  What is a mole? 1. SI base unit to measure the amount of a substance 2. The amount of a substance.

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.

8 | 1 CHAPTER 8 CHEMICAL COMPOSITION. 8 | 2 Atomic Masses Balanced equations tell us the relative numbers of molecules of reactants and products. C +

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

 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.

Section 10.3 Percent Composition and Chemical Formulas.

Percent Composition, Empirical and Molecular Formulas.

Determining Chemical Formulas

Mass % and % Composition Mass % = grams of element grams of compound X 100 % 8.20 g of Mg combines with 5.40 g of O to form a compound. What is the mass.

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

Definition Emperical formula – uses symbols form elements combined with subscripts showing the smallest whole number ratio of elements in a compound Also.

Mr. Chapman Chemistry 20. Converting from grams to moles Need: Moles and Mass worksheet.

DO NOW – EXPLAIN WHY THE SPECTRUM OF CL 2 LOOKS THE WAY IT DOES IN TERMS OF PEAK HEIGHTS, NUMBER OF PEAKS, AND MASSES.

Friday, April 26 th : “A” Day Monday, April 29 th : “B” Day Agenda  Begin 7.3: “Formulas & Percentage Composition”  In-Class Assignment: Practice.

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

Empirical and Molecular Formulas. CH 2 O CH 3 OOCH = C 2 H 4 O 2 CH 3 O Empirical Formula A formula that gives the simplest whole-number ratio of the.

Molecular Formulas. An empirical formula shows the lowest whole-number ratio of the elements in a compound, but may not be the actual formula for the.

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

  Proportion or ratio of each element in a chemical compound  Percentage by mass of an element in a particular substance  Expressed as grams of element.

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 Al 2 Se 3  What is the percent composition of Al 2 Se 3 ?

Empirical and Molecular Formulas

C.10: Empirical and Molecular Formulas

Chapter 7 Chemical Quantities

EMPIRICAL FORMULA VS. MOLECULAR FORMULA .

You need a calculator AND periodic table for today’s notes

Section 9.3—Analysis of a Chemical 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.

P2O5 Percent to mass P %43.64g O 56.36%56.36g Mass to mole P 43.64g/30.97g/mol O 56.36g/16.00g/mol Divide by small P 1.41mol÷1.41=1.

Percent Composition and Molecular Vs. Empirical Formulas

Empirical Formula.

7.5 – NOTES Molecular Formulas

Empirical and Molecular Formulas

Chapter 7 Chemical Quantities

Vocabulary Percent Composition -

Empirical Formulas.

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.

Empirical & Molecular Formulas

Percent Composition and Molecular Vs. Empirical Formulas

Chapter 11: More on the Mole

7.3 – NOTES Molecular Formulas

WUP#21 Which is an empirical formula (E.F.) and which is a molecular formula(M.F.)? 1. H2O 2. C4H10 3. CO2 4. CH2O 5. C6H12O6.

PERCENT COMPOSITION used to determine the formula of a compound

Presentation transcript:

Empirical Formula

Definition A formula that shows the simplest whole-number ratio of the atoms in a compound Ex: H 2 O Not an Ex: H 4 O 2

Percent to mass, Mass to mole, Divide by small, Multiply 'til whole. Poem for Steps **If you have a 100g sample, the percent composition is the same as the mass

Example #1 Determine the empirical formula for a compound with the percent composition of 40.00% carbon, 6.72% hydrogen, and 53.28% oxygen.

Example #2 Determine the empirical formula for methyl acetate, which has the following chemical analysis: 48.64% carbon, 8.16% hydrogen and 43.20% oxygen.

Example #3 A 50.0 g sample of a compound contains g Na, g O, and g S. Determine the empirical formula.

Example #4 A 50.0 g sample of a compound contains 2.52 g Be, 5.01 g Al, g Si, and g O. Determine the empirical formula.