PPT-Percent Composition and Empirical Formulas

Percent Composition percent by mass of atoms present in a compound mass of atom total molar mass x 100 water is 8881 Oxygen and 1119 Hydrogen O 160018016 x 100 8881 . Molecular Formulas. Let’s use those mole conversions!. Empirical formula . tells you the lowest ratio of atoms within a molecule. Molecular formula . tells you the actual ratio of atoms within a molecule. You should know this for the quiz!. Empirical and Molecular Formulae. Empirical Formula. If needed, change % to g.. Do . a molar conversion to change from . g. mol. Divide each of these numbers by the smallest number. . Siyao. . Guo. . . Ilan. . Komargodski. . New York University . . Weizman. . Institute of Science. Circuit. : directed acyclic graph. Gates labeled by . , . and . . operations. Fan-out 2.. Chemistry GT 3/20/15. Drill. Calculate the percent composition of Na. 2. SO. 4. .. HW: Molecular Formula WS (pg. 4). MM. =142.05 . g. /mol. 32.37% Na, 22.58% S, 45.05% O. Chem. Joke of the Day. The photon checked into a hotel. What did it say when the bellhop asked for its bag?. Molecular Formulas. Let’s use those mole conversions!. Empirical formula . tells you the lowest ratio of atoms within a molecule. Molecular formula . tells you the actual ratio of atoms within a molecule. Percent Composition. . Percent Composition – . the percentage by mass of each element in a compound . Percent =. _______. Part. Whole. x 100%. So…. Percent composition. of a compound or =. molecule. Empirical & Molecular Formula Notes. Drill. Calculate the percent composition of Na. 2. SO. 4. .. HW:. Finish pg. 3 (Empirical Formulas). MM=142.05 . g. /mol. 32.37% Na, 22.58% S, 45.05% O. Objectives. Percent Composition, . Empirical/ Molecular . Formula . Finishing Up Ch. 10. In 1811, Avogadro proposed a hypothesis:. Volumes of gases at the same temp and pressure have the same number of particles. Chapter 5: Molecules and Compounds. Learning Goals. Write . chemical formulas.. Determine . the total number of each type of atom in a chemical formula.. Classify . elements as atomic or molecular.. Classify . Compounds are ALWAYS composed of elements in fixed ratios. This is often referred to as the . Law of Definite Proportions.. This law states that elements are always present in the same proportions by mass in a compound. I.e. H. Naming Ionic Compounds. The names of ionic compounds consists of the names of the ions that make up the compound.. Names of . cations. include the elements of which they are composed.. Names of anions are altered names of elements.. 23Provided FormulasThese formulas are available to exam candidates when taking the CFP Certication Examination Objectives:. -         . The student will determine an empirical, or simplest, formula from percentage composition data..  . PA Science and Technology Standards: 3.4.10.A; 3.4.12.A. PA Mathematics Standards: 2.2.11.A, 2.3.11.C, 2.4.11.E, 2.5.11.A. Percent Composition. Breaks down the amount of an element in a compound by percentage. Total mass of element / total mass of compound. Result will always be a decimal. Multiply by 100 to get the final percentage.