Chapter 6: Chemical Composition
Section 6 5: Percent Composition of Compounds •Sometimes it is not enough to know a compound’s composition in terms of numbers of atoms; it may also be useful to know its composition in terms of the massesof its elements •We can calculate the mass fraction by dividing the mass of a given elementin one mole of a compound by the mass of one
Chapter 6: Chemical Composition
1 dozen carbon atoms = _____ carbon atoms 1 dozen eggs = _____ eggs 1 dozen donuts = _____ donuts Two ways of specifying quantity: 1) Mass 2) Number Your coworker brought in 42 donuts How many dozen donuts did she bring to share? The counting unit used in chemistry is the MOLE (mol) 1 Mole = 6 022 x 1O 23 of Anything
A Introduction to Chemistry, Atoms and Elements
Atoms come together to form compounds and compounds can break apart into atoms or be combined to form new compounds Main areas of Chemistry: Organic – compounds of carbon (some exceptions CO2 CO considered inorganic) Inorganic – compounds that do not include carbon Analytical – composition of matter and mixtures (what is there and how much)
Quantitative Composition of Compounds
Composition Usually made up of nonmetal atoms Held together by covalent bonds Types of Formulas Empirical Molecular Structural CH3 C2H6 C H H H C H H H Atomic and
Composition of Atoms: The Sub-atomic Particles
Answers to Composition of Atoms: The Sub-atomic Particles 1 Write complete definitions for each of the following terms Include one additional piece of information such as an example or application: a) Atomic number: the number of protons in the nucleus of an atom This determines what type of atom (element) it is
Percent composition (mass percent, percent composition by mass)
Mass composition of: 75 7 C, 8 8 H, and 15 5 O yielded these molar ratios 6 30 mol C : 8 7 mol H : 0 969 mol O, which is the same as saying 6 30 atoms C : 8 7 atoms H : 0 969 atoms O Atoms do not combine as fractions or pieces (0 30, 0 7, 0 969), so we must scale up to reach whole atoms (whole numbers)
The Air We Breathe
atoms) molecules H 2N2 O2 Cl 1 7 Few other nonmetals occur as polyatomic made up of more than two atoms) molecules S8, P4 Group 8A or 18 elements; inert gases or noble gases are mono-atomic Compounds: A pure substance/compound has the same composition and properties regardless of its source ** The fact that elemental composition (chemical
Composition of Organic Gas Emissions from Flaring Natural Gas
COMPOSITION OF INCOMPLETE COMBUSTION USED IN FLARE SPECIATION PROFILES 15 •Assuming that products of incomplete combustion containing 1 or 2 carbon atoms are ubiquitous in hydrocarbon flames, we derive representative composition for products of incomplete combustion •Composition data in the table are unsuitable for directly speciating
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