At a given temperature, \(K=1.3 \times 10^{-2}\) for the reaction $$ \mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(g) \rightleftharpoons 2 \mathrm{NH}_{3}(g) $$ Calculate values of \(K\) for the following reactions at this temperature. a. \(\frac{1}{2} \mathrm{~N}_{2}(g)+\frac{3}{2} \mathrm{H}_{2}(g) \rightleftharpoons \mathrm{NH}_{3}(g)\) b. \(2 \mathrm{NH}_{3}(g) \rightleftharpoons \mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(g)\) c. \(\mathrm{NH}_{3}(g) \rightleftharpoons \frac{1}{2} \mathrm{~N}_{2}(g)+\frac{3}{2} \mathrm{H}_{2}(g)\) d. \(2 \mathrm{~N}_{2}(g)+6 \mathrm{H}_{2}(g) \rightleftharpoons 4 \mathrm{NH}_{3}(g)\)

Short Answer

Expert verified
The equilibrium constants for the new chemical reactions are: a. \(K_{a} \approx 0.114\) b. \(K_{b} \approx 76.92\) c. \(K_{c} \approx 8.79\) d. \(K_{d} \approx 1.69 \times 10^{-4}\)

Step by step solution

01

Relation between \(K\) values in scaled reactions

When we multiply a chemical reaction by a factor, the relationship between the equilibrium constants is given by: \(K_{new} = K^x\), where \(x\) is the constant by which we scale the reaction. From this, we get: \[K_{a} = K^{\frac{1}{2}} = (1.3 \times 10^{-2})^{\frac{1}{2}}\] b. Reverse the reaction:
02

Relation between \(K\) values in reversed reactions

The equilibrium constant of the reverse reaction is given by \(K_{new} = \frac{1}{K}\), such that: \[K_{b} = \frac{1}{1.3 \times 10^{-2}}\] c. Combine reverse and half of the initial reaction:
03

Calculating \(K\) for combined reactions

As the new reaction is a combination of the half reaction and reverse reaction, we can multiply their \(K\) values to find the new \(K\). First, we find the half reaction \(K\): \(K_{half} = K^{\frac{1}{2}} = (1.3 \times 10^{-2})^{\frac{1}{2}}\), and then the new \(K\) equation: \[K_{c} = K_{b} \times K_{half} = \frac{1}{1.3 \times 10^{-2}} \times (1.3 \times 10^{-2})^{\frac{1}{2}}\] d. Multiply the given reaction by 2:
04

Relation between \(K\) values in scaled reactions (continued)

As discussed in part a, in scaled reactions, we have \(K_{new} = K^x\), and for two times the reaction, we get: \[K_{d} = K^2 = (1.3 \times 10^{-2})^2\] #Step 3: Calculate the equilibrium constants for each new reaction# Perform the calculations for each part: a. \(K_{a} = (1.3 \times 10^{-2})^{\frac{1}{2}} \approx 0.114\) b. \(K_{b} = \frac{1}{1.3 \times 10^{-2}} \approx 76.92\) c. \(K_{c} = \frac{(1.3 \times 10^{-2})^{\frac{1}{2}}}{1.3 \times 10^{-2}} \approx 8.79\) d. \(K_{d} = (1.3 \times 10^{-2})^2 \approx 1.69 \times 10^{-4}\) #Step 4: Present the equilibrium constants for each new reaction# The equilibrium constants for the new chemical reactions are: a. \(K_{a} \approx 0.114\) b. \(K_{b} \approx 76.92\) c. \(K_{c} \approx 8.79\) d. \(K_{d} \approx 1.69 \times 10^{-4}\)

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Most popular questions from this chapter

Consider the following reaction at some temperature: $$ \mathrm{H}_{2} \mathrm{O}(g)+\mathrm{CO}(g) \rightleftharpoons \mathrm{H}_{2}(g)+\mathrm{CO}_{2}(g) \quad K=2.0 $$ Some molecules of \(\mathrm{H}_{2} \mathrm{O}\) and \(\mathrm{CO}\) are placed in a \(1.0\) -L container as shown below. When equilibrium is reached, how many molecules of \(\mathrm{H}_{2} \mathrm{O}, \mathrm{CO}\), \(\mathrm{H}_{2}\), and \(\mathrm{CO}_{2}\) are present? Do this problem by trial and errorthat is, if two molecules of \(\mathrm{CO}\) react, is this equilibrium; if three molecules of \(\mathrm{CO}\) react, is this equilibrium; and so on.

The equilibrium constant \(K_{\mathrm{p}}\) for the reaction $$ \mathrm{CCl}_{4}(g) \rightleftharpoons \mathrm{C}(s)+2 \mathrm{Cl}_{2}(g) $$ at \(700^{\circ} \mathrm{C}\) is \(0.76\) atm. Determine the initial pressure of carbon tetrachloride that will produce a total equilibrium pressure of \(1.20 \mathrm{~atm}\) at \(700^{\circ} \mathrm{C}\).

At high temperatures, elemental nitrogen and oxygen react with each other to form nitrogen monoxide: $$ \mathrm{N}_{2}(g)+\mathrm{O}_{2}(g) \rightleftharpoons 2 \mathrm{NO}(g) $$ Suppose the system is analyzed at a particular temperature, and the equilibrium concentrations are found to be \(\left[\mathrm{N}_{2}\right]=0.041 M\), \(\left[\mathrm{O}_{2}\right]=0.0078 M\), and \([\mathrm{NO}]=4.7 \times 10^{-4} M .\) Calculate the value of \(K\) for the reaction.

Consider the reaction $$ \mathrm{Fe}^{3+}(a q)+\mathrm{SCN}^{-}(a q) \rightleftharpoons \mathrm{FeSCN}^{2+}(a q) $$ How will the equilibrium position shift if a. water is added, doubling the volume? b. \(\mathrm{AgNO}_{3}(a q)\) is added? (AgSCN is insoluble.) c. \(\mathrm{NaOH}(a q)\) is added? \(\left[\mathrm{Fe}(\mathrm{OH})_{3}\right.\) is insoluble.] d. \(\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3}(a q)\) is added?

An \(8.00-\mathrm{g}\) sample of \(\mathrm{SO}_{3}\) was placed in an evacuated container, where it decomposed at \(600^{\circ} \mathrm{C}\) according to the following reaction: $$ \mathrm{SO}_{3}(g) \rightleftharpoons \mathrm{SO}_{2}(g)+\frac{1}{2} \mathrm{O}_{2}(g) $$ At equilibrium the total pressure and the density of the gaseous mixture were \(1.80 \mathrm{~atm}\) and \(1.60 \mathrm{~g} / \mathrm{L}\), respectively. Calculate \(K_{\mathrm{p}}\) for this reaction.

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