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N2O4 and N2H4 react with each other to form NO and H2O. What is the maximum mass (in...

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lak-86 | Student, Undergraduate | Salutatorian

Posted August 21, 2013 at 4:43 AM via web

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N2O4 and N2H4 react with each other to form NO and H2O.

What is the maximum mass (in grams) of NO that could be obtained from 15.5 g of  N2O4 and 4.68 g of N2H4 when they react?

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llltkl | College Teacher | Valedictorian

Posted August 21, 2013 at 5:43 AM (Answer #1)

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The balanced chemical equation for the reaction is:

`2N_2O_4+N_2H_4-> 6NO+2H_2O`

Molar mass of `N_2H_4=14*2+1*4=32` g/mol

Molar mass of `N_2O_4=14*2+16*4=92` g/mol

15.5 g `N_2O_4` =`15.5/92` =`0.168478` moles

4.68 g `N_2H_4` =`4.68/32` =`0.14625` moles

1 mol `N_2H_4` reacts with 2 mol `N_2O_4`

Hence, 0.14625 moles `N_2H_4` require 2*0.168478=0.336956 moles `N_2O_4` for the reaction

But there is only 0.168478 moles of `N_2O_4` .

Hence, `N_2O_4` is the limiting reagent.

From the stoichiometry of the given reaction, considering the limiting reagent:

2 mol `N_2O_4` reacts with sufficient `N_2H_4` to produce `6*30=180` g `NO` .

Hence, 0.168478 moles of `N_2O_4` reacts with sufficient `N_2H_4` to produce `(180*0.168478)/2=15.16302~~15.2` g `NO` .

Therefore, 15.2 g `NO` can be obtained from 15.5 g of  `N_2O_4` and 4.68 g of `N_2H_4` when they react.

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