PPT-Empirical and Molecular Formulas

Chemistry GT 32015 Drill Calculate the percent composition of Na 2 SO 4 HW Molecular Formula WS pg 4 MM 14205 g mol 3237 Na 2258 S 4505 O Chem Joke of the Day The photon checked into a hotel What did it say when the bellhop asked for its bag. . vs. . Empirical Formula. Different compounds can have the . same. empirical formula. but . different. molecular formulas. .. Empirical . Formula is a . reduced. . form of Molecular formula . Molecular Formula and Empirical Formula. Get started. Imagine that Excel is open and you’re looking at the “Entertainment” section of a household expense budget.. Cell C6 in the worksheet is empty; the amount spent for CDs in February hasn’t been entered yet.. Yewande Dayo . Student Pharmacist. Objectives. Perform calculations to reduce and enlarge formulas for pharmaceutical preparations stated in metric quantities. Perform calculations to reduce and enlarge formulas for pharmaceutical preparations stated in proportional parts. . Siyao. . Guo. . . Ilan. . Komargodski. . New York University . . Weizman. . Institute of Science. Circuit. : directed acyclic graph. Gates labeled by . , . and . . operations. Fan-out 2.. Objectives. To learn how to work out the percentage composition by weight of a compound. To use percentage composition to work out empirical formulae. Percentage compositions. This means what percentage of each element is present in a compound, and therefore tells you what masses of each element are present in any given mass of a compound. . Represents the . actual. number of . atoms. of each . element. in . compound. Not necessary for . ionic compounds. Necessary for . covalent compounds. The molecular formula for water is . H. 2. O. Seating Chart. Warm Up 1/5-6. Imagine your boss wants you to count the number of Styrofoam packing peanuts in a large bag. Suppose you found the mass of 100 peanuts to be 5.5 g. How could you use this to find the number of peanuts in the bag?. Microsoft Office 2010 Fundamentals. 1. Introduction. 2. The real power of a spreadsheet program such as Excel is its ability to perform simple and complex calculations on worksheet data.. Using the commands located on the Formulas tab of the Ribbon, you can enter formulas to perform calculations or use predefined formulas, called functions.. 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 . The Mole. Chemist’s counting number. amount. of a substance . 1 mole is equal to 6.022 x 10. 23. atoms or particles or molecules (Avogadro’s number). There are always 6.022 x 10. 23 . particles in . Percent Composition. Percent . Composition – . the . percentage . by mass of . each . element in a . compound (*note: not the ratio of elements in the compound). Law of Definite Proportions . – compounds always contain the same proportions of elements by mass.. 23Provided FormulasThese formulas are available to exam candidates when taking the CFP Certication Examination Determining Molecular Formulas. Calculate the molecular formula of a compound whose molar mass is 60.0 g/mol and has an empirical formula of CH4N.. What you need:. Empirical Formula. Molar Mass. Calculate the molar mass of the empirical formula. Percent Composition. ~percent by mass of atoms present in a compound. = (mass of atom). . (total molar mass) x 100. water is . 88.81 . % Oxygen and . 11.19 . % Hydrogen. O- 16.00/18.016 x 100 = . 88.81 .