PPT-A compound will have the same composition by mass.

Calculate the following percentage by mass percent portiontotal x 100 If two samples are the same substance they should have the same percent composition by mass A compound will have the same physical and chemical characteristics. Example The dog like the cat is a household pet When you contrast two subjects you show how they are different Example The dog unlike the cat is dependent on its master Sometimes both comparison and contrast are used in the same sentence Example Bot . 10/22/14. Define the following terms in your own way: . "percent by mass" . "percent by volume". Objective Tonight’s Homework. To determine the mass of each element in a compound. pp 208: 51, 52, 53, 54. 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?. trifluoride. molecule?. 1.8 to 1. 3.0 to 1. 3.5 to 1. 5.3 to 1. 6.0 to 1. D. A hydrocarbon sample with a mass of 6 grams underwent . c. ombustion, producing 11 grams of carbon dioxide. If all. o. f the carbon initially present in the compound was . 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. 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. In a group, calculate the percentage of flasks, owls, . Marios. , pencils & stars. What if this was related to mass? Calculate the % by mass for each of the objects.. 100 g. 20 g. 5. 0 g. 2 g. 6. 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.. SIMPLE SENTENCES . A simple sentence conveys a single, simple idea. It contains an independent clause that has a subject and a verb. It makes sense on its own.. . We enjoyed the concert.. AND COMPLEX SENTENCES. Composition of Substances and Solutions Atomic Mass and Formula Mass; Mole & Molar Mass; Percent Composition of Compounds; Determination of Empirical & Molecular Formulas; Molarity Other Units for Solution Concentrations Announcements Textbook homework Assignment 2 due tomorrow in discussion (pg. 16) Pre & Post-lecture Assignments (Lon- Capa ) 8:00 am Tuesday & Thursday Electronic Homework #2 due Wednesday at 10:00 pm 2 H. 2. + O. 2. .  2 H. 2. O. Read as “2 moles of hydrogen combined with 2 moles of oxygen yield 2 moles of water” . So what’s a mole??. Definitions. Mole- unit of measurement defined by the amount of substance that contains the same number of particles in 12 g of a Carbon-12 atom. 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. Objectives:. -         . The student will determine percentage composition from formula data.. -         . The student will determine percentage composition of a hydrated salt..