Develop expressions for the mole fractions of reacting species as functions of t

Question

Develop expressions for the mole fractions of reacting species as functions of the reaction coordinate for A system initially containing 10 mol NH_3 and 11 mol O_2 and undergoing the reaction 4NH_3(g) + 50_2 (g) rightarrow 4NO(g) + 6 H_2O(g) A system initially containing 4 mol H_2S and 6 mol O_2 and undergoing the reaction 2 H_2S(g) + 3O_2 (g) rightarrow 2 SO_2 (g) + 2 H_2O(g) A system initially containing 5 mol NO_2, 6 mol NH_3, and 2 mol N_2 and undergoing the reaction 6NO_2(g) + 8NH_2(g) rightarrow 7N_2(g) + 12H_2O(g)

Explanation / Answer

The forumula for mole fraction is

mole fraction = moles of the component/total no of moles of all components.

a) mole fraction of NH3 = moles of the NH3/total no of moles of all components

= 10/(10+11) = 10/21 = 0.4761

mole fraction of O2= moles of the O2/total no of moles of all components

= 11/(10+11) = 11/21 = 0.5239

b) mole fraction of H2S= moles of the H2S/total no of moles of all components

= 4/(4+6) = 4/10 = 0.4

mole fraction of O2 = moles of the O2/total no of moles of all components

= 6/(4+6) = 6/10 = 0.6

c) mole fraction of NO2= moles of the NO2/total no of moles of all components

= 5/(5+6+2) = 5/13 = 0.3846

mole fraction of NH3= moles of the NH3/total no of moles of all components

= 6/(5+6+2) = 6/13 = 0.4615

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