ปริมาณสารสัมพันธ์ เรื่อง molarity เคมีม.4
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สารละลายEP3 โมลาริตี(molarity : M)
วิดีโอนี้จัดทำขึ้นเพื่อให้นักเรียนได้ทบทวนความรู้เกี่ยวกับการคำนวณความเข้มข้นของสารละลายในหน่วยโมลาริตี
โมลาริตี(molarity : M) หรือ โมลาร์ เป็นหน่วยความเข้มข้น ที่เป็นอัตราส่วนของจำนวนโมลของตัวถูกละลายที่อยู่ในสารละลาย ปริมาตร 1 ลิตร (L) จะเขียนแทนด้วยสัญลักษณ์ M สามารถเขียนเป็นสูตรได้ดังนี้ โมลาร์ มีหน่วยเป็น mol/L
โมลาริตี
โมลาร์
molarity
mol/L
Stoichiometry Tutorial: Step by Step Video + review problems explained | Crash Chemistry Academy
Stoichiometry: meaning of coefficients in a balanced equation; coefficient and molar ratios, molemole calculations, massmass calculations, massparticle calculations, and massvolume calculations. For help with balancing equations, see this video https://youtu.be/Vym8RUqKhcw, and for help with solution stoichiometry, see this video https://youtu.be/rPND65LPwS0, and for help with identifying reaction types, see this video https://youtu.be/YRxpjlBFI30.
—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.
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What’s the Difference Between Molarity and Molality?
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What’s the difference between molarity and molality? They are both measures of concentration, but molarity has to do with volume (in Liters) and molality has to do with mass (in kilograms). Also, molarity talks about the volume of the total solution (solute and solution combined), and molality is about mass of the solute and solvent separately.
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