The molecularity of the elementary step Cl₂ + CHCl₃ → HCl + CCl₄ is:
Two molecules collide → molecularity = 2.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Order and Molecularity and Units of Rate Constant
#reaction stoichiometry
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For A₂(g) + B₂(g) 2AB(g) , Kp = 9 at 600 K. If initial pressures are PA₂ = 1 atm , PB₂ = 1 atm , what is PAB at equilibr
Let 2x be PAB , PA₂ = 1 - x , PB₂ = 1 - x , total pressure = (1 - x) + (1 - x) + 2x = 2 . Kp = ((PAB)²/PA₂ PB₂) = ((2x)²/(1 - x)²) = 9 , (4x²/(1 - x)²) = 9 , (2x/1 - x) = 3 , 2x = 3 - 3x , 5x = 3 , x = 0.6 , PAB = 2 × 0.6 = 1.2 atm .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Ionic Equilibrium - Acids Bases and pH and Ionization of Weak Acids Bases
For 2AB(g) A₂(g) + B₂(g) , Kp = 0.25 at 600 K. If the initial pressure of AB is 4 atm, what is PA₂ at equilibrium?
Let PA₂ = PB₂ = x , PAB = 4 - 2x , total pressure = 4 - 2x + 2x = 4 . Kp = (PA₂ PB₂/(PAB)²) = (x²/(4 - 2x)²) = 0.25 , (x/4 - 2x) = 0.5 , x = 2 - x , 2x = 2 , x = 1 atm .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Ionic Equilibrium - Acids Bases and pH and Ionization of Weak Acids Bases
For A(g) 2B(g) , Kc = 0.25 at 500 K. If 0.4 mol A is in a 1 L vessel, what is [B] at equilibrium?
Initial: [A] = 0.4 M , [B] = 0 . Let 2x = [B] , [A] = 0.4 - x . Kc = ([B]²/[A]) = ((2x)²/0.4 - x) = 0.25 , 4x² = 0.1 - 0.25x , x ≈ 0.125 , [B] = 0.25 M .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Ionic Equilibrium - Acids Bases and pH and Ionization of Weak Acids Bases
For the reaction A(g) + 2B(g) 3C(g) , Kc = 27 at 300 K. If 0.5 moles of A and 2 moles of B are placed in a 1 L vessel, w
Initial: [A] = 0.5 M , [B] = 2 M , [C] = 0 . Let 3x be moles of C formed, so A decreases by x , B by 2x . At equilibrium: [A] = 0.5 - x , [B] = 2 - 2x , [C] = 3x . Kc = ([C]³/[A][B]²) = ((3x)³/(0.5 - x)(2 - 2x)²) = 27 , (27x³/(0.5 - x)(4 - 4x + 4x²)) = 27 , x³ = (0.5 - x)(1 - x)² , x ≈ 0.3 , [C] = 3 × 0.3 = 0.9 M .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Chemical Equilibrium - Law of Mass Action and Equilibrium Constant
