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Stoichiometry: meaning of coefficients in a balanced equation; coefficient and molar ratios, mole-mole calculations, mass-mass calculations, mass-particle calculations, and mass-volume calculations. For help with mole conversions, see this video • Mole Conversions Tutorial: how to con... , for help with balancing equations, see this video • Balancing Chemical Equations in THREE... , and for help with solution stoichiometry, see this video • Solution Stoichiometry tutorial: How ... , and for help with identifying reaction types, see this video • Types of Chemical Reactions: How to c... . • • • —More on Stoichiometry | Wikipedia— • Stoichiometry...is the calculation of relative quantities of reactants and products in chemical reactions. • Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of product can be empirically determined, then the amount of the other reactants can also be calculated.... • Here, one molecule of methane reacts with two molecules of oxygen gas to yield one molecule of carbon dioxide and two molecules of water. Stoichiometry measures these quantitative relationships, and is used to determine the amount of products/reactants that are produced/needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry. In the example above, reaction stoichiometry measures the relationship between the methane and oxygen as they react to form carbon dioxide and water. • Because of the well known relationship of moles to atomic weights, the ratios that are arrived at by stoichiometry can be used to determine quantities by weight in a reaction described by a balanced equation. This is called composition stoichiometry. • Gas stoichiometry deals with reactions involving gases, where the gases are at a known temperature, pressure, and volume and can be assumed to be ideal gases. For gases, the volume ratio is ideally the same by the ideal gas law, but the mass ratio of a single reaction has to be calculated from the molecular masses of the reactants and products. In practice, due to the existence of isotopes, molar masses are used instead when calculating the mass ratio. • Wikipedia contributors. Stoichiometry. Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 27 May. 2016. Web. 27 May. 2016. • CC Academy videos are easy 101 crash course tutorials for step by step Chemistry help on your chemistry homework, problems, and experiments. • Check out other popular CC Academy videos on this channel: • -Balancing chemical equations in three easy steps • -Types of Chemical Reactions: How to classify five basic reaction types • -Solution Stoichiometry • -Orbitals the Basics: Atomic Orbitals Tutorial • -Hybrid Orbitals Explained • -Polar Molecules Tutorial: How to determine polarity in a molecule • -Metallic Bonding and Metallic Properties Explained • -Covalent Bonding Tutorial • -Ionic Bonds, Ionic Compounds: What is an ionic bond and how do ionic compounds form • -Electronegativity and bond character (bond type): non-polar covalent, polar, ionic • -Metric Unit Prefix Conversions: How to Convert Metric System Prefixes • -Metric unit conversions shortcut: fast, easy how-to with examples • -Mole Conversions Tutorial: how to convert mole - mass, mole - particle, mass - particle problems • -Frequency, Wavelength, and the Speed of Light • -The Bohr Model of the Atom and Atomic Emission Spectra • -What is Heat: A brief introduction at the particle level • -Rutherford's Gold Foil Experiment • -Unit Conversion Using Dimensional Analysis Tutorial • -What is Fire: Combustion Reaction Tutorial • -Quantum Numbers Tutorial • -Electron Configurations Tutorial and How to Derive Electron Configurations from the Periodic Table • -Concentration and Molarity Explained • -Heating Curves Tutorial • -Naming Ionic Compounds • -Limiting Reactant Tutorial • -PV=nRT The Ideal Gas Law: What is it, What is R, Four practice problems solved including molar mass • -Gas density and PV=nRT, the ideal gas law • -Surface Tension - What is it, how does it form, what properties does it impart
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