The reaction 2H2S (g) + 3O2(g) <-----------> 2SO2 (g ) + 2H2O (g) + heat is at the equilibrium, how can we increase the concentration of SO2 ?

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Explanation: 

This is the Le chatelier's principle problem , to increase the concentration of SO2 we have to shift the equilibrium to the right , for this to happen we have to increase the concentration of the reactant either H2S or O2 , so if we increase the concentration of eithher of the reactant O2 or H2S we would be able to shift the reaction to the right in order to consume the additonal reactant .

Answer: 

To increase the concentration of SO2 increase the concentration of either reactant and shift the equilibrium towards right to form more product .