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What Is the Atom Economy? | Chemical Calculations | Chemistry | FuseSchool
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- 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
- in Industry we are normally only interested in one of the products the other products are sometimes waste atom economy simply shows us the
- 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
- 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
- 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
- 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
- bromoethane by reacting bromine with Ethan although we have not even considered any molecular masses yet pause the video and take a moment to
- predict the atom economy in this reaction where only one product is formed
- 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
- useful product is 188 divided by a mass of all the products 188 equals 1 multiplied by 100 equal
- 100% the atom economy of this reaction is 100% which hopefully you predicted since only one product is formed and therefore
- there are no waste products so now let's take a look at calculating the atom economy of a reaction with waste
- 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
- economy firstly we must calculate the molecular mass of each compound n2h4 has a molecular mass of
- 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
- mass of 32 the total sum of all the products including hydrogen is
- 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
- economy of 29.5 this number is quite low and this reflects the large amount of waste product produced in water and sodium
- chloride we could describe this reaction as inefficient and a wasteful reaction it is important that industry Works towards the most efficient
- industrial processes with high atom economy as this is important for sustainable development a efficient processes
- conserve natural resources and create less waste now at the end of this video you should understand what Atom economy
- shows and be able to calculate the atom economy of a reaction