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  • Created by: Jade
  • Created on: 29-11-10 20:45

Percentage Atom Economy

Bromo-methane is reacted with sodium hydroxide to make methanol. 

CH2Br + NaOH ----> CH3OH + NaBr  

Calculate the atom economy. 


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% atom economy = mass of desired product             x 100

                               total mass of reactants 

 

(12+(3x1)+16+1)            x 100

(12+(3x1)+80)+(23+16+1)                       

 

32g                    x100

135g                          

= 23.7%

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Ar from Mass Spectrum

From a mass spectrum graph we see that 79% of magnesium atoms have a mass charge of 24, 10% have a mass charge of 25 and 11% have a mass charge of 26. 

 

What is the Ar of magnesium, using this mass spec?

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79 x 24 = 1896 

10 x 25 = 250 

11 x 26 = 286 

1896 + 250 + 286 = 2432 

 

2432 

100

= 24.32 = 24.3

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