Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NTA Abhyas JEE Main2020ChemistryChemical KineticsPractice

The gas phase decomposition of dimethylether follows first order kinetics C H 3 - O - C H 3 g → C H 4 g + H 2 g + C O g The reaction is carried out in constant volume container at 500 o C and has a half-life of 14 .5 min . Initially only dimethylether is present at a pressure of 0 .40 atm . The total pressure of the system after 12 min is x 100 atm . The value of x is [Given 10 0 .25 = 1 .778 ]

Correct answer

75

Step-by-step solution

Now: 12 = 2.303 0.693 × 14.5 log ⁡ 0.4 0.4 - x 0.25 = log ⁡ 0.4 0.4 - x 1 0 0.25 = 0.4 0.4 - x 0.4 0.4 - x = 1.778 ⇒ x = 0.175 Total pressure = 0.4 - 0.75 + 0.175 + 0.175 + 0.175 = 0.75 a t m now: x 100 = 0.75 x = 75

Practice Chemical Kinetics on Quantrex Academy →

More from Chemical Kinetics

For a reversible reaction R P , at constant temperature, both the forward and the backward reactions are first order elementary reactions with rate constants k_f and k_b , respecti 2026For a first-order reaction R P at a given temperature, k is the rate constant. For this reaction, at the given temperature, the concentrations of R and P at a time t are [ R ] and 2026Given below are two statements: R=8.314 J K ⁻¹ mol ⁻¹ and 1 cal =4.2 J Statement I: When E_a=12.6 kcal/mol, the room temperature rate constant is doubled by a 10 ,^ C increase in t 2026Decomposition of a hydrocarbon follows the equation k = (5.5 10¹¹ , s ⁻¹) ,e^ -28000 , K T . The activation energy of reaction is __________ kJ mol ⁻¹ . (Nearest Integer) Given : R 2026For a reaction A P at T K , the half life (t_ 1/2 ) is plotted as a function of initial concentration [A]₀ of A as given below. The value of x in the given figure is _______ s (Nea 2026First order gas phase reaction A B + C p_i = initial pressure of gas A, p_t = total pressure of the reaction mixture at time t Expression of rate constant ( k ) is 2026If the half life of a first order reaction is 6.93 minutes then the time required for completion of 99 % of the reaction will be _____ minutes. (Given : 2 = 0.3010 ) 2026Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical initial concentration of reactants. Which of t 2026 Full Chemical Kinetics list All NTA Abhyas JEE Main PYQs