![]() We hope this grams-to-moles calculator (or moles-to-grams calculator) will help you with your chemical calculations! You may also find our titration calculator useful. So we now know we need 10.8 g of NaOH to exactly neutralize our amount of hydrochloric acid. Mole × molecular weight = mass (rearrange the equation),Īs 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: ![]() Mole = mass / molecular weight (multiply both sides by molecular weight), As we need to find the mass of NaOH to add, let's quickly rearrange the equation: Now we know the number of molecules of HCl we have, and since the reaction is 1:1, we need the exact same number of molecules of NaOH to neutralize it. It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, 1. We can work out the number of molecules by multiplying the moles by Avogadro's constant above. atomic mass, the quantity of matter contained in an atom of an element. Let's plug these numbers into the above equation: We know we have 10 g of HCl, which has a molecular weight of 36.5 g/mol. Let's do a quick example to help explain how to convert from moles to grams or grams to moles. If you wanted to find the concentration of the hydrochloric acid, you could use our concentration calculator. To know how to calculate moles, the equation is: Library of Mass Finder 2.1, Institute of Organic Chemistry, Hamburg, 2001. It is, therefore, useful to find out exactly how many molecules of HCl are in the solution. officinalis were analysed: 1) cultivated in the garden of the Research and Science Innovation Centre (RSIC) in Wola Zdybska near Lublin (Poland) (51☄4’49N 21★0’38E) (VO RSIC) 2). Now, you want the resulting solution to be perfectly neutral, so you don't want to add too much or too little NaOH, making it too basic or acidic respectively. Let's say you want to neutralise 10 g of hydrochloric acid (HCl in water) with some sodium hydroxide (NaOH). So why do chemists use moles, and why do you need a mole calculator? Well, as we said above, it provides a useful metric when dealing with reactions. It turns out memorising that definition for my GCSE chemistry exam was pointless. Prior to that, a mole was defined as the number of atoms in 12 grams of carbon-12 (an isotope of carbon). The official International System of Units definition is that a mole is the amount of a chemical substance that contains exactly 6.02214076×10 23 ( Avogadro's constant) atoms, molecules, ions or electrons (constitutive particles), as of 20 th May 2019. A mole is how chemists define an amount of substance, useful when dealing with many different molecules reacting at once (i.e., any reaction). Just kidding – we're sure you've never heard that joke before. A mole is a small, subterranean mammal belonging to the family Talpidae.
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