FOLLOW-UP PROBLEM 17.1 Write the reaction quotient, Q., for each of the following reactions: (a) The first step in nitric acid production, NH3(g) + 0,(g) = NO(g) + H2O(g) (b) The disproportionation of nitrogen monoxide, NO(g) = N,0(g) + NO2(8)

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Chapter12: Chemical Equilibrium
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Sample Problem 17.1 Writing the Reaction Quotient from the Balanced
Equation
Problem Write the reaction quotient, Q, for each of the following reactions:
(a) The decomposition of dinitrogen pentoxide, N,O3(g)
(b) The combustion of propane, C;Hs(g) + O2(g) = CO2(g) + H,O(g)
Plan We balance the equations and then construct the reaction quotient (Equation 17.4).
Solution (a) 2N,0s(g) = 4NO2(g) + O2(g)
= NO2(g) + O2(g)
[NO,M0,]
[N,O,
(b) C;H¿(g) + 50,(g) = 3CO2(g) + 4H,O(g)
[CO.F[H,O]
[C,H,[0,
Check Be sure that the exponents in Q. are the same as the balancing coefficients.
A good check is to reverse the process and see if you obtain the balanced equation:
change the numerator to products, the denominator to reactants, and the exponents to
coefficients.
FOLLOW-UP PROBLEM 17.1 Write the reaction quotient, Q, for each of the following
reactions:
(a) The first step in nitric acid production, NH3(g) + O2(g) =
(b) The disproportionation of nitrogen monoxide, NO(g)
NO(8) + H2O(8)
N,0(g) + NO,(g)
Transcribed Image Text:Sample Problem 17.1 Writing the Reaction Quotient from the Balanced Equation Problem Write the reaction quotient, Q, for each of the following reactions: (a) The decomposition of dinitrogen pentoxide, N,O3(g) (b) The combustion of propane, C;Hs(g) + O2(g) = CO2(g) + H,O(g) Plan We balance the equations and then construct the reaction quotient (Equation 17.4). Solution (a) 2N,0s(g) = 4NO2(g) + O2(g) = NO2(g) + O2(g) [NO,M0,] [N,O, (b) C;H¿(g) + 50,(g) = 3CO2(g) + 4H,O(g) [CO.F[H,O] [C,H,[0, Check Be sure that the exponents in Q. are the same as the balancing coefficients. A good check is to reverse the process and see if you obtain the balanced equation: change the numerator to products, the denominator to reactants, and the exponents to coefficients. FOLLOW-UP PROBLEM 17.1 Write the reaction quotient, Q, for each of the following reactions: (a) The first step in nitric acid production, NH3(g) + O2(g) = (b) The disproportionation of nitrogen monoxide, NO(g) NO(8) + H2O(8) N,0(g) + NO,(g)
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