You are doing repeated examples to build up your skill, your speed, and your experience. Exercise An exercise is a calculation or other task where you know what to do. Determine the fraction and percent composition of each element below (answer to one decimal place): 1. The fraction composition is a good in-between step. 18.02 18.02 This is called the percent composition. Water, H2O, for example has a molar mass of 18.02 g. Fraction and Percent Composition It is useful to determine how much of a compound`s mass is made up of each element. Examples: (give answers to two decimal places) H2SO4 Cl2 Molar Masses Given a periodic table, you should be able to calculate the molecular mass (in u`s) or the molar mass (in grams) for any element or compound.
![three monosulfur fluorides are observed: sf2, sf4, and sf6. of these, ________ is/are polar three monosulfur fluorides are observed: sf2, sf4, and sf6. of these, ________ is/are polar](https://media.cheggcdn.com/media%2F82b%2F82bfdaa4-8c3d-4a29-ae93-ee759c87259b%2Fimage.png)
M O L A R M A S S & % C O M P O S I T I O N I. Practice for Both Types of Compounds Formula HCl PCl5 K2S NiSO4 ClF3 OF2 Al(OH)3 NCl3 Name Formula Name carbon dioxide ammonium carbonate sulfur dichloride calcium iodide boron trifluoride phosphorus triiodide magnesium perchlorate potassium permanganate aluminum phosphate dioxygen difluoride Naming Binary Nonmetal Compounds Name Formula CCl4 P4O10 ClF3 BCl3 SF4 Name Formula HBr N2F4 XeF3 PI3 SCl2 Nitrogen trifluoride nitrogen monoxide nitrogen dioxide dinitrogen tetroxide dinitrogen monoxide Writing Formulas of Binary Nonmetal Compounds Name Formula Name phosphorus trichloride phosphorus pentachloride sulfur hexafluoride disulfur decafluoride xenon tetrafluoride Formula Naming Ionic Compounds Cation Cu2+ Ba2+ NH4+ Ag+ Fe3+ Anion OH SO42 Cr2O72 C2H3O2 S2 1 Formula Name Writing Ionic Formulas Cl NO3 S2 CO32 N3 PO43 OH Second element name ends with ide carbon monoxide carbon dioxide dinitrogen monoxide
![three monosulfur fluorides are observed: sf2, sf4, and sf6. of these, ________ is/are polar three monosulfur fluorides are observed: sf2, sf4, and sf6. of these, ________ is/are polar](https://media.cheggcdn.com/media%2F890%2F890421f4-89fe-40ed-abd1-7192e90d2ae5%2Fimage.png)
Ionic + ion before ion Formula ex: NaCl (NH4)2SO4 Al2S3 Name of cation + name of anion sodium chloride ammonium sulfate aluminum sulfide Binary Nonmetal usually the less electronegative atom is first ex: CO CO2 N2O Indicate the number (mono, di, tri, and kind of atoms. you must recognize the type of compound before you try to name it. The two types of compounds we will focus on first are ionic compounds (formed from positive and negative ions) and binary nonmetal compounds (molecular compounds).
![three monosulfur fluorides are observed: sf2, sf4, and sf6. of these, ________ is/are polar three monosulfur fluorides are observed: sf2, sf4, and sf6. of these, ________ is/are polar](https://techiescientist.com/wp-content/uploads/2020/09/SF2-lewis-structure.jpg)
Additionally, some compounds (H2O, NH3, CH4, etc.) simply have common names that must be memorized. Writing Formulas and Naming Compounds Introduction Writing formulas and naming compounds can be confusing because there are different types of compounds that follow different rules.