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Use of Formulae Masses and Moles (but no badgers)
Formula Mass Sum of all the average atomic masses of all the atoms in the formula for the compound Example: Find formula mass for potassium chlorate First: find formula!
Formula mass problem continued Then: Mass of K: 1 atom/mole x amu/atom = amu Mass of Cl: 1 atom/mole x amu/atom = amu Mass of O: 3 atoms/mole x amu/atom=48.00 amu Formula mass = amu amu amu = amu
Molar Mass Mass of one mole of the compound Numerical value is equal to formula mass Units are grams!
Problem: Find molar mass of barium nitrate First, find formula! Then: Barium: 1 mole x g/mole = g Nitrogen: 2 mole x g/mole = g Oxygen: 6 mole x g/mole = g Sum: g g g = g/mole
Conversion: Molar mass can be used to convert from grams to moles and back again Show all your work! Do Sample problem 7-8 and 7-9
Calculations with Elements and Compounds The Mole Concept Rev Pisgah High School M. Jones.
Lesson Starter Write the stock system names for MnO, PbO 2 Write the stock system names for MnO, PbO 2 Manganese (II) Oxide Manganese (II) Oxide Lead.
IIIIIIIV Ch. 10 – The Mole I. Molar Conversions A. What is the Mole? n A counting number (like a dozen) n Avogadros number (N A ) n 1 mole =
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Using the methods of stoichiometry, we can measure the amounts of substances involved in chemical reactions and relate them to one another. Stoichiometry.
Based on lab evidence For example, we know that 4.9 g of magnesium react with 32.0 g of Bromine. How can we figure out the formula of the compound.
1 Chapter 7- Molecular Formulas. 2 Warm Up: Determine the name and molar mass of the following compounds. NaOH MnO 2 H 2 SO 4.
We got Moles! Mr. Bimber Freedom High School. Warm up questions 1. What is the smallest bit of an element? 2. What is the smallest bit of a compound?
EMPIRICAL FORMULA empirical formulaThe empirical formula represents the smallest ratio of atoms present in a compound. molecular formulaThe molecular formula.
Empirical and Molecular Formulas Unit Empirical and Molecular Formulas An empirical formula shows the simplest whole number ratio of atoms of.
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What does the little number below each Element mean? What are its units? amu/atom.
IIIIIIIV Ch. 3 & 7 – The Mole I. Molar Conversions (p.80-85, )
Stoichiometry Chapter 10 The Mole A counting unit A counting unit Similar to a dozen, except instead of 12, its 602,000,000,000,000,000,000,000 Similar.
What is the mass in grams of one atom of a particular isotope? Consider 1 atom of C-12. The isotope notation is: 6 protons 6 neutrons 6 electrons X 1.67.
1 Chemical Quantities or. 2 How you measure how much? How you measure how much? n You can measure mass, n or volume, n or you can count pieces. n We measure.
Stoichiometry The Mole A counting unit A counting unit Similar to a dozen, except instead of 12, its 602,000,000,000,000,000,000,000 Similar to a dozen,
1. 2 Chapter 10 Chemical Quantities or 3 How you measure how much? How you measure how much? n You can measure mass, n or volume, n or you can count.
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Unit 6 - Chapter 12 The Mole. The Mole – a word that means a # Other words that mean #s: One dozen = 12 One gross = 144 One score = 20 One ream = 500.
Converting Grams To Moles and Moles To Grams By Rochelle Berk and Shelly Huff.
Mole to Mole Conversions Last semester you learned to balance chemical equations. The coefficients in a balanced equation show molar ratios A molar ratio.
Topic 14 Topic 14 Topic 14: The Mole Table of Contents Topic 14 Topic 14 Basic Concepts Additional Concepts.
Percent Composition Percent = part / whole Example: MgO Find molar mass of whole compound: MgO = = 40.3 grams % Mg (by mass) = mass of Mg.
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