Note: Mole is a metric unit of amount of substance. Nanomole is a metric unit of amount of substance. List of these foods starting with the highest contents of Tryptophan and the lowest contents of Tryptophan. Calculate how much of this gravel is required to attain a specific depth in a cylindrical , quarter cylindrical or in a rectangular shaped aquarium or pond [ weight to volume volume to weight price ]. Ammonium chloride [NH 4 Cl] weighs 1 The metric base SI unit of luminous intensity is 1 candela [ candela ] Amount of substance is a quantity proportional to the number of entities N in a sample.
The Conversions and Calculations web site. Forum Login Register. Convert nanomoles to moles [nmol to mol] nmol:nanomole, mol:mole Convert nmol to mol an amount of substance conversion table Convert moles to volume and weight for specific elements, substances, compounds and materials. Temperature can cause some solvents to expand, and if the solute does not expand with the solvent, then the molar concentration decreases. It is also possible for the solvent to evaporate while the amount of the solute remains the same, as the temperature increases.
In this case, the concentration of the solution will increase. In some cases, the opposite happens. Sometimes raising or lowering the temperature changes the solubility. As a result, all or parts of the solvent stop being dissolved in the solution, and the concentration is decreased.
Molar concentration is measured in moles per unit of volume, for example in moles per liter or moles per cubic meter. The latter is the SI unit. It can also be measured in moles per another unit of volume. To find molar concentration we need to know the amount of substance and the total volume of the solution. To determine the amount of the substance we could use the molecular formula for this substance and information about the mass of this substance that is present in the solution.
In particular, to find how many moles of the solution we have, we can look up the atomic mass of each atom present in the molecule in the periodic table, and then divide the total mass of the substance by the total atomic weight of atoms in the molecule. We have to make sure that before we add the atomic masses together, we multiply each of the atomic masses for a specific atom by the number of atoms of this type present in the molecule.
The reverse is also possible. If we know the molar concentration of our solution and the formula of the solute, then we can determine the amount of solvent present in the solution, both in moles and in grams. For this, we will need to check the periodic table for the atomic weights, as described earlier. Let us calculate the molarity of a solution that has 3 tablespoons of baking soda mixed with 20 liters of water.
We will work with atoms in this example, so let us find the atomic masses for sodium Na , hydrogen H , carbon C , and oxygen O. Now let us add these atomic masses. We will get The atomic masses in the periodic table are generally specified in atomic mass units. This is the case with our data as well. This atomic mass in atomic mass units corresponds to the mass of 1 mole of an element in grams. We were given 51 grams of soda. Let us find how many moles we have by dividing the total amount of 51 grams by the number of grams in one mole, or 84 grams.
We get about 0. This means that we diluted 0. Let us divide this amount of the baking soda by 20 liters to get the molar concentration: 0. We got a low concentration because we used such a small amount of soda and diluted it in a large volume of water. Let us try another example and find a molar concentration of 1 cube of sugar in one cup of tea. Table sugar is made up of sucrose. For convenience, molar concentration is often used when working with chemical reactions.
The branch of chemistry that deals with determining the quantities of initial substances and products of chemical reactions, stoichiometry , often deals with molar concentration. We can find molar concentration by using the chemical formula of the final component that becomes a solute, as we did for the baking soda, but we can also use chemical equations to find it. We will need to know the formulas and the amounts for the substances reactants that are being used for our chemical reaction to create the solute as the final product.
We will then have to balance the equation to find out the resulting product, and then use the periodic table, as described above, to find the needed information for calculating molar concentration. In this case, we can also do the reverse as well, if we know the molar concentration. Let us look at a simple example. We will use baking soda again, and mix it with vinegar for an interesting chemical reaction. You can find these substances easily, you probably already have them in your pantry. The concentration can be smaller, depending on the manufacturer and the country of origin, because different concentrations are considered standard in different countries.
We do not have to worry about water in this reaction because water and baking soda do not react with each other. We can then mix sodium acetate with water and proceed with calculating the molar concentration, as we did in the earlier example for baking soda. We have to be careful when calculating the volume of the water to account for the water that the acetic acid was mixed with to make vinegar and the water that was a product of the chemical reaction.
Sodium acetate is an interesting chemical compound — it is used in heating pads and hand warmers. When we use stoichiometry to determine either the amount of reactants or the amount of the final product later used in calculations of the molar concentration, we will notice that only a limited amount of one reactant will react with other reactants.
This will impact the yield of our final product. Whenever we use a recipe, be it in cooking, when making medication, or even when creating an environment for aquarium fish, we are concerned with concentration.
While in everyday life we may prefer working with grams, in chemistry or pharmacy molar concentration is often used. Molar concentration is important when mixing compounds to create medicine because it influences how this medicine affects the body.
Some medications are poisonous if the concentration is too high, and many are not as effective when the concentration is too low.
0コメント