The Mole The Mole It's not a spy, a machine for digging tunnels, a burrowing animal, or a spot of skin pigmentation - it's - a unit of measurement containing about 6.02 x 10 23 particles. Chemists created the mole as their own counting unit. The Chemical Mole 1mole of atoms is

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ByWriting Empirical and Molecular Formulas. What is an empirical formula?. A chemical formula in which the ratio of the elements are in the lowest terms is called an empirical formula . . Example:.

ByLecture #22. pH of Very Weak Acids; (b) pH of Dilute Solutions of Strong Acids; . Chemistry 142 B Autumn Quarter 2004 J. B. Callis, Instructor. Acid Solutions in Which Water Contributes to [H + ]. Previously, we have assumed that the acid is the dominate source of H + ions.

ByChapter 5 Gases. A Gas- Uniformly fills any container Mixes completely with any other gas Can easily be compressed Exerts pressure on its surroundings. The properties of a gas depends upon four variables- Pressure (P) Is equal to force/unit area Measured by a barometer

ByGas Stoichiometry . Non-Standard Conditions. Nonstandard Conditions. Gas volume changes dramatically when pressure or temperature change. Key: The mole-mol calculation must take place at STP. Doing the Calculations. Given a volume of gas at other than STP?

By1 mol O 2. 2 mol MgO . x . x . 32.00 g O 2. 1 mol O 2. 40.31 g MgO. x . 1 mol MgO. 1) a) H = 2.06%, S = 32.69%, O = 65.25% b) Ca = 54.09%, O = 43.18%, H = 2.73% 2) 24 x .787 + 25 x .101 + 26 x .112 = 24.3 3) a) 98.08 g/mol, b) 759.70 g/mol

ByOutline 1/12/07. First Chem seminar today… Pick up CAPA #2 - in front ChemBoard Assignment = Monday Fill in keypad response unit #’s… Today: Surfactants Colligative Properties Calculating Colligative Effects. Surfactants:.

ByPhthalate Plasticizers. CE 435 Introduction to Polymers Brian Amato Sarah Karl Carla Ng. Timeline (history). European Parliament calls for alternatives to phthalates. IARC Re-classifies DEHP as non-carcinogenic. First Plasticizer. DEHP Declared Carcinogenic. Phthalates Introduced. 1860.

ByStoichiometry Chapter 10. The Mole. A counting unit Similar to a dozen, except instead of 12, it’s 602,000,000,000,000,000,000,000 6.02 X 10 23 (in scientific notation) This number is named in honor of Amedeo Avogadro (1776 – 1856). Molar Mass. The Mass of 1 mole (in grams)

ByMeet the Mole. Moles. The mole is a unit of measurement. The unit can be defined in multiple ways. (We’ll learn 3 today.) In its simplest terms, it represents a specific number. Dozen = what number? Pair = what number? Baker’s dozen = what number? Mole = 6.02 x 10 23

ByChapter 4 Calculation Used in Analytical Chemistry. Some Important Units of Measurement

ByThe Mole. Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second?. Mollionaire. Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second? A: $ 6.02 x 10 23 / $1 000 000 000

ByThe Mole. Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second?. Background: atomic masses. Look at the “atomic masses” on the periodic table. What do these represent? E.g. the atomic mass of C is 12 (atomic # is 6)

ByLesson Objectives Calculate percent composition from a chemical formula Determine the empirical and molecular formulas for a substance. Percent Composition, Empirical, and Molecular Formulas. Percent composition describes the contribution of each element to the total mass of a compound

ByWhere we’ve been for ~ 3 weeks now:. Basic mole calculations (pp.112-124) % composition problems/combustion analysis (pp.384-392) Reaction balancing (pp. 392-395 ) `body parts’ calculations (no formal section in text) Next: Reaction stoichiometry ( pp. 396-406 ).

ByMoles!. Review!. How many Hydrogen atoms are in 2.5 mols of Hydrogen? . Review. How many moles are in 2.5 x 10 5 atoms of magnesium, Mg. Molar Mass. Molar mass is the weight in grams of one mole for any element or compound .

ByStoichiometry. Chapter 3 E-mail: benzene4president@gmail.com Web-site: http://clas.sa.ucsb.edu/staff/terri/. Stoichiometry - Ch. 3.

ByReminder: 1 mol of anything e.g. Oxygen, carbon, dollars, toys, etc. is 6.02 x 10 23. Let’s look at this pile of carbon in the form of charcoal. I bet you there is a bunch of carbon moles in there. Let’s see how much.

ByChemistry 20 Mole Conversions. What is a Mole?. A term of measurement A counting number Similar to saying 1 dozen = 12 things Avogadro's Number (N A ) 6.02 x 10 23 items A VERY LARGE NUMBER!!!. = 1 mole.

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