Definitions of molecular mass, molecular weight, molar mass and molar weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. Maybe an example would explain it best. molar mass and molecular weight. Turns out that memorising that definition for my GCSE chemistry exam was pointless. As 1.626×10 23 molecules of NaOH is also equal to 0.27 moles, and we know that the molecular weight of NaOH is 40, we can use these numbers to get: mass = 40 / 0.27 = 10.8 g To complete this calculation, you have to know what substance you are trying to convert. H 2 O crystallizes from water solutions between 12.3 and 61.8 °C. These relative weights computed from the chemical equation are sometimes called equation weights. Sodium Hydroxide (NaOH) - Sodium Hydroxide is the chemical name of NaOH. We will determine the concentration of the solution by titrating a known mass of a known acid with your sodium hydroxide solution, using an acid-base indicator to find the endpoint of the titration. So why do chemists use moles, and why do you need a mole calculator? Lets say you want to neutralise 10 g of hydrochloric acid (HCl in water) with some sodium hydroxide (NaOH). Lets plug these numbers into the above equation: mole = 10 / 36.5 = 0.27 moles = 1.626×10^23 molecules of HCl. Why not check out our molarity calculator or our percent yield calculator. Just kidding - we're sure you've never heard that joke before. We use the most common isotopes. Browse the list of The reason is that the molar mass of the substance affects the conversion. A common request on this site is to convert grams to moles. Explanation of how to find the molar mass of NaOH: Sodium hydroxide. Shame. Let's do a quick example to help explain how to convert from moles to grams, or grams to moles. This site explains how to find molar mass. Now you need to know the atomic weights of the above mentioned elements. Now we know the amount of molecules of HCl we have, and, since the reaction is 1:1, we need the exact same number of molecules of NaOH to neutralise it. (Also useful for any serious industrial applications, for all you chemical engineers out there.). NaOH is a white crystal at room temperature. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. Calculate the molecular weight Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). A mole is how chemists define an amount of substance, useful when dealing with many different molecules reacting at once (i.e. Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. With our moles to grams converter, you can seamlessly convert between mass, molecular weight and moles. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Property Name Property Value Reference; Molecular Weight: 72.039 g/mol: Computed by PubChem 2.1 (PubChem release 2019.06.18) Hydrogen Bond Donor Count We can work out the number of molecules by timesing the moles by Avogadro's constant above. common chemical compounds. You may also find our titration calculator of use to you. of a chemical compound, More information on The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. Finding molar mass starts with units of grams per mole (g/mol). Molar mass of 10 NaOH = 49.99711 g/mol. ... determine the identity of an acid by titrating a known mass with out standardized NaOH solution and determining its molecular weight. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. any reaction). mole = molecular weight / mass (mulitply both sides by mass) mole * mass = molecular weight (divide both sides by mole) mass = molecular weight / mole. To know how to calculate moles, the equation is: If you wanted to find the concentration of the hydrochloric acid, you could use our concentration calculator. Now, you want the resulting solution to be perfectly neutral, so you don't want to add too much or to little NaOH, making it too basic or acidic respectively. Check out 22 similar stoichiometry and solutions calculators , How to calculate moles - moles to grams converter. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. As 1.626×1023 molecules of NaOH is also equal to 0.27 moles, and we know that the molecular weight of NaOH is 40, we can use these numbers to get: So we now know we need 10.8 g of NaOH to exactly neutralise our amount of hydrochloric acid. While we're on the topic of chemistry, we have a number of other calculators what you might find useful. Explanation of how to find the molar mass of NaOH: Sodium hydroxide.A few things to consider when finding the molar mass for NaOH:- make sure you have the correct chemical formula.- always include the units for molecular weight (grams/mole).- make sure you do the math right - follow the order of operations.Watch: Molar Mass in Three Easy Steps: https://youtu.be/o3MMBO8WxjYNote that molecular weight, molar mass, and gram formula mass are all the same thing.Periodic Table Image from: https://commons.wikimedia.org/wiki/File:Periodic-table.jpgFinding the Molar Mass (sometimes called Molecular Weight although the units are different) of a compound is a essential skill for the chemistry topic of stoichiometry and the first step in converting from moles to grams (or grams to moles).For more chemistry help visit http://www.Breslyn.org .