Molar concentration also called molarity , amount concentration or substance concentration is a measure of the concentration of a chemical species , in particular of a solute in a solution , in terms of amount of substance per unit volume of solution. Molar concentration or molarity is most commonly expressed in units of moles of solute per litre of solution. In thermodynamics the use of molar concentration is often not convenient because the volume of most solutions slightly depends on temperature due to thermal expansion. This problem is usually resolved by introducing temperature correction factors , or by using a temperature-independent measure of concentration such as molality. The reciprocal quantity represents the dilution volume which can appear in Ostwald's law of dilution. If a molecular entity dissociates in solution, the concentration refers to the original chemical formula in solution, the molar concentration is sometimes called formal concentration or formality F A or analytical concentration c A.
8.3: Mole-to-Mole Conversions
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These are worked chemistry problems showing how to calculate the number of moles of reactants or products in a balanced chemical equation. Determine the number of moles of N 2 O 4 needed to react completely with 3. The first step is to check to see that the chemical equation is balanced. Make sure the number of atoms of each element are the same on both sides of the equation. Remember to multiply the coefficient by all atoms following it. The coefficient is the number in front of a chemical formula. Multiply each subscript only by the atom right before it.
Mass fraction (chemistry)
Last Updated: October 20, References. This article was co-authored by Meredith Juncker, PhD. Her studies are focused on proteins and neurodegenerative diseases. There are 10 references cited in this article, which can be found at the bottom of the page.
Chemical equations are symbolic representations of chemical reactions. In a chemical equation, the reacting materials are written on the left, and the products are written on the right; the two sides are usually separated by an arrow showing the direction of the reaction. The numerical coefficient next to each entity denotes the absolute stoichiometric amount used in the reaction. Because the law of conservation of mass dictates that the quantity of each element must remain unchanged over the course of a chemical reaction, each side of a balanced chemical equation must have the same quantity of each particular element. In a balanced chemical equation, the coefficients can be used to determine the relative amount of molecules, formula units, or moles of compounds that participate in the reaction.