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A mole can be a number of molecules as well. For other atoms, such as oxygen, a mole will weigh a different amount (in the case of oxygen, a mole of oxygen atoms weighs sixteen grams). It’s a big number but what exactly does it represent?Ī mole of carbon atoms is 6.02 x 10 23 atoms and this number of atoms weighs twelve grams because the relative atomic mass of carbon is twelve, as given by the periodic table. When fully written out, Avogadro’s number is 602 000 000 000 000 000 000 000, or 602 followed by twenty-one zeroes. The number 6.02 x 10 23 is called Avogadro’s number and is often written in scientific notation to consume less space. A mole is equal to 6.02 x 10 23, which is quite a bit larger than twelve. What is a Mole?Ī mole is a number in the way that a dozen is a number. When calculating molarity, the amount of solute is measured in moles (mol). An example of a solute is sucrose when it has been dissolved into water to make sugar water. What is a Solute?Ī solute is a chemical component of a mixture that is dissolved in the solvent. When calculating molarity, the volume of solvent is measured in liters (L). In an aqueous solution, water is the solvent. The solvent is usually the component of the mixture that is present in the largest amount. A solvent can be a solid or gas but is typically a liquid. What is a Solvent?Ī solvent is very simply the substance into which the solute is dissolved. A fully uniform mixture is called a homogeneous mixture, or a solution.
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The formula for calculating molarity is as shown below:Ī solution is a mixture of two or more substances in which all of the components are completed dissolved and the mixture is uniformly composed. In chemistry, molarity is always expressed as the number of moles of the solute found in one liter of solvent. The concentration of a solution depends on the amount of solute added to a volume of solvent. Molarity is a value that expresses the concentration of a solute in a solution. Calculating the molarity of a solution or using the equation for molarity to determine the quantity of a solute that must be weighed out in order to prepare the appropriate solution concentration is something that a chemist does multiple times a day. Being able to calculate the concentration of a solution is an important and basic piece of knowledge for a chemist. The molarity formula is one of the building blocks for understanding chemistry and chemical reactions.