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  • Balance the following reaction using the half-reaction method. <img alt="a\ H_2S+ b\ HNO_3\rightarrow xH_2SO_4+yNO_2+zH_2O" src="http://entrancecorner.oncodecogs.com/gif.latex?a%5C%20H_2S

Balance the following reaction using the half-reaction method.

a\ H_2S+ b\ HNO_3\rightarrow xH_2SO_4+yNO_2+zH_2O

and find the value of x+y+z, when balanced with the smallest possible integers.

Option: 1

12


Option: 2

13


Option: 3

14


Option: 4

15


Answers (1)

best_answer

In ionic form:H_2S+NO_3^-\rightarrow NO_2+SO_4^{2-}

Half reactions:

H_2S\rightarrow SO_4^{2-},  NO_3^-\rightarrow NO_2

\mathrm{OH :\ H_2S\rightarrow SO_4^{2-}+10H^++4H_2O+8e^-}

\mathrm{RH: \ NO_3^-+2H^+\rightarrow NO_2+H_2O+e^-}

Balancing and adding we get

H_2S+8NO_3^-+6H^+\rightarrow SO_4^{2-}+8NO_2+4H_2O

Now, add 2H+ ions on both sides to obtain the molecular form of the species involved in the redox reaction

H_2S+8HNO_3+6H^+\rightarrow H_2SO_4+8NO_2+4H_2O

x=1,y=8,z=4  x+y+z=13


 

 

 

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Rishi

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