What Is the Atom Economy? | Chemical Calculations | Chemistry | FuseSchool
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https://www.youtube.com/watch?v=Zuyk4hfbjSA

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0:05 in this video we will learn about atom economy what it shows and how to calculate atom economy using examples when a reaction is carried out
0:15 in Industry we are normally only interested in one of the products the other products are sometimes waste atom economy simply shows us the
0:25 amount of product that was useful as a percentage of all the products that were formed the higher the atom economy the less waste is
0:35 produced to carry out an atom economy calculation we must look at our reaction and the equation and use the molecular masses remember we want to calculate the
0:47 amount of useful product as a percentage of the total products so the equation for this will be atom economy equals the mass of the desired products divided by
0:59 the the mass of all the products multiplied by 100 let's try an example in this reaction we want to make one two di
1:09 bromoethane by reacting bromine with Ethan although we have not even considered any molecular masses yet pause the video and take a moment to
1:21 predict the atom economy in this reaction where only one product is formed
1:34 now let us carry out the calculation one 12 Di bromoethane has a molecular mass of 188 look at our equation the mass of the
1:45 useful product is 188 divided by a mass of all the products 188 equals 1 multiplied by 100 equal
1:58 100% the atom economy of this reaction is 100% which hopefully you predicted since only one product is formed and therefore
2:09 there are no waste products so now let's take a look at calculating the atom economy of a reaction with waste
2:18 products hydren is a useful Rocket Fuel it can be made in the following reaction pause the video now and attempt to calculate the atom
2:35 economy firstly we must calculate the molecular mass of each compound n2h4 has a molecular mass of
2:45 32 sodium chloride 58.5 and water H2O 18 first we need to identify our useful product this is hydrogene N2 H4 it has a
3:02 mass of 32 the total sum of all the products including hydrogen is
3:12 108.5 therefore the mass of our useful product 32 divided by mass of all the products 108.5 multiplied by 100 gives us an atom
3:27 economy of 29.5 this number is quite low and this reflects the large amount of waste product produced in water and sodium
3:40 chloride we could describe this reaction as inefficient and a wasteful reaction it is important that industry Works towards the most efficient
3:51 industrial processes with high atom economy as this is important for sustainable development a efficient processes
4:01 conserve natural resources and create less waste now at the end of this video you should understand what Atom economy
4:11 shows and be able to calculate the atom economy of a reaction