In which of the given reactants is K p greater than, less than and equal to K c ? a) SO 3 (g) + NO (g) ⇌ SO 2 (g) + NO 2 (g) b) P 4 (s) + 5 O 4 (g) ⇌ P 4 O 10 (s) c) 4 NH 3 (g) + 3 O 2 (g) ⇌ 2 N 2 (g) + 6 H 2 O (g)

Hey guys, we're not gonna attempt to do practice Question one that was left. When we're finding out who will be greater K. P. Or K. C. So I gave you guys a huge hint before we left. I told you what would happen if delta N. Was equal to zero? What would the relationship be between K. P. And K. C. So let's just do that. We're gonna say K. P. Equals K. C. R. T. 20. Remember any number to the zero power equals what? When you punch it into your calculator, it's gonna equal one. So we're gonna say here, K. P. Equals K. C. Times one. So one times anything is that same number? So when delta and equal zero K. P. Equals K. C. We'll say they're equal to one another and we're gonna say where do we see them equal to each other? That's going to be in the first one because in the first one we have two moles Of gas as products -2 moles of gas as reactors. So they'll be equal to one another. And now that we've seen that connection, what you should have realized after that was if your delta end variable is less than one, then we're gonna say that K. C. Is actually greater than K. P. So if we take a look at the next one here, we have zero moles of products as gas. So here it's gonna be delta and equal zero and we have five moles of gas as reactant minus five. So this equals negative five. If you punch that into your calculator make make a sequel to any number, you'll see that K P will always be smaller when delta N is less than one or actually less than zero. Really? Actually, so it's less when it's less than zero, we're gonna say that. So here we're gonna say that K C is actually greater than K. P. And then finally we're gonna say when delta N is greater than or equal to one. Now that R K P is greater than R K. C. Now you can just play around with the delta and variable plug in different types of numbers. You will see what happens between the relationship of K. P two K C. Now, if we go on to the next question, practice question two requires a bit more stretching and more calculating in order to find the correct answer. So let's take a look at at it really quickly and I'll give you guys some hints on how to approach it. It says given the hypothetical reaction to a solid plus question, Mark, B gas gives us three C. Gas, K P. Is this number and K C. Is this number at 250 degrees Celsius, what is the value of the coefficient of B. So we know we're dealing with K P and K C. So we know we're gonna have to deal with this equation in some way, we know what K P. Is, we know what K C is. R is always that number and we know what temperature is. We just needed to change it to kelvin. We have all the variables. We need. The only thing that's missing is delta N. So the key to figuring out what the coefficient is to this B is to first figuring out what is the value for delta N. Let's see if you guys can get as close as possible to the correct answer for delta N. And from there we can figure out what the question mark for B is attend this on your own. But if you get stuck, don't worry, click on the explanation button and I'll pop up and give you guys a quick explanation on how to approach this problem. Good luck guys.

16. Chemical Equilibrium

Intro to Chemical Equilibrium

General Chemistry

16. Chemical Equilibrium

Intro to Chemical Equilibrium

Struggling with General Chemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

In which of the given reactants is K_p greater than, less than and equal to K_c?
a) SO₃ (g) + NO (g) ⇌ SO₂ (g) + NO₂ (g)
b) P₄ (s) + 5 O₄ (g) ⇌ P₄O₁₀ (s)
c) 4 NH₃ (g) + 3 O₂ (g) ⇌ 2 N₂ (g) + 6 H₂O (g)

a) Kc > Kp, b) Kc < Kp, c) Kc = Kp

a) Kc = Kp, b) Kc < Kp, c) Kc > Kp

a) Kc < Kp, b) Kc = Kp, c) Kc > Kp

a) Kc = Kp, b) Kc > Kp, c) Kc < Kp

Verified step by step guidance

Understand the relationship between Kp and Kc: Kp is the equilibrium constant for gases expressed in terms of partial pressures, while Kc is expressed in terms of concentrations. The relationship between Kp and Kc is given by the equation: <math xmlns='http://www.w3.org/1998/Math/MathML'><mi>K</mi><msub><mi>p</mi></msub><mo>=</mo><mi>K</mi><msub><mi>c</mi></msub><mo>×</mo><mo>(</mo><mi>R</mi><mi>T</mi><mo>)</mo><msup><mo>∆</mo><mi>n</mi></msup></math>, where Δn is the change in moles of gas, R is the gas constant, and T is the temperature.

Calculate Δn for each reaction: Δn is the difference between the moles of gaseous products and the moles of gaseous reactants. For reaction a) SO3 (g) + NO (g) ⇌ SO2 (g) + NO2 (g), Δn = (1 + 1) - (1 + 1) = 0. For reaction b) P4 (s) + 5 O4 (g) ⇌ P4O10 (s), Δn = 0 - 5 = -5. For reaction c) 4 NH3 (g) + 3 O2 (g) ⇌ 2 N2 (g) + 6 H2O (g), Δn = (2 + 6) - (4 + 3) = 1.

Analyze the effect of Δn on Kp and Kc: If Δn = 0, Kp = Kc because the term <math xmlns='http://www.w3.org/1998/Math/MathML'><mo>(</mo><mi>R</mi><mi>T</mi><mo>)</mo><msup><mo>∆</mo><mi>n</mi></msup></math> becomes 1. If Δn > 0, Kp < Kc because the term <math xmlns='http://www.w3.org/1998/Math/MathML'><mo>(</mo><mi>R</mi><mi>T</mi><mo>)</mo><msup><mo>∆</mo><mi>n</mi></msup></math> is greater than 1. If Δn < 0, Kp > Kc because the term <math xmlns='http://www.w3.org/1998/Math/MathML'><mo>(</mo><mi>R</mi><mi>T</mi><mo>)</mo><msup><mo>∆</mo><mi>n</mi></msup></math> is less than 1.

Apply the analysis to each reaction: For reaction a), since Δn = 0, Kp = Kc. For reaction b), since Δn = -5, Kp > Kc. For reaction c), since Δn = 1, Kp < Kc.

Summarize the results: Based on the analysis, the correct relationships are: a) Kc = Kp, b) Kc > Kp, c) Kc < Kp.

4:21m

Watch next

Master Chemical Equilibrium Concepts with a bite sized video explanation from Jules

Start learning

Struggling with General Chemistry?

In which of the given reactants is Kp greater than, less than and equal to Kc?a) SO3 (g) + NO (g) ⇌ SO2 (g) + NO2 (g)b) P4 (s) + 5 O4 (g) ⇌ P4O10 (s)c) 4 NH3 (g) + 3 O2 (g) ⇌ 2 N2 (g) + 6 H2O (g)

Watch next

In which of the given reactants is K_p greater than, less than and equal to K_c?
a) SO₃ (g) + NO (g) ⇌ SO₂ (g) + NO₂ (g)
b) P₄ (s) + 5 O₄ (g) ⇌ P₄O₁₀ (s)
c) 4 NH₃ (g) + 3 O₂ (g) ⇌ 2 N₂ (g) + 6 H₂O (g)