Exams › JEE Main › Chemistry

For the reaction N2(g) + 3H2(g) -> 2NH3(g), the rate of formation of NH3 is 2.5*10⁻⁴ mol L⁻¹ s⁻¹. What are the rate of disappearance of N2 and the rate of disappearance of H2 (in mol L⁻¹ s⁻¹), respectively?

1. 3.75 * 10⁻⁴, 1.25 * 10⁻⁴
2. 1.25 * 10⁻⁴, 2.5 * 10⁻⁴
3. 1.25 * 10⁻⁴, 3.75 * 10⁻⁴
4. 5.0 * 10⁻⁴, 3.75 * 10⁻⁴

Correct answer: 1.25 * 10⁻⁴, 3.75 * 10⁻⁴

Solution

Using stoichiometric ratios, rate of N2 loss = (1/2)(2.5e-4) = 1.25e-4 and rate of H2 loss = (3/2)(2.5e-4) = 3.75e-4 mol L⁻¹ s⁻¹.

Related JEE Main Chemistry questions

• For the reaction A → products, the half-life is 120 min when the initial concentration of A is 8.0 × 10⁻² M. If the starting concentration is changed to 4.0 × 10⁻² M, the half-life increases to 240 min. What is the reaction order?
• For a first-order process A → B, if the rate constant is k and the starting concentration of A is 0.5 M, what is the half-life?
• For the elementary gas-phase reaction A(g) + 2B(g) → C(g) + D(g), an experiment starts with initial partial pressures p_A = 0.60 atm and p_B = 0.80 atm. If the partial pressure of C becomes 0.20 atm, then the reaction rate compared with the initial rate is
• From the experimental data below for the reaction A + B → products, identify the rate law that fits the observations. Exp. 1: [A] = 0.012, [B] = 0.035, initial rate = 0.1 Exp. 2: [A] = 0.024, [B] = 0.070, initial rate = 0.8 Exp. 3: [A] = 0.024, [B] = 0.035, initial rate = 0.1 Exp. 4: [A] = 0.012, [B] = 0.070, initial rate = 0.8
• A radioactive substance is accidentally spread on the floor of a room. If its half-life is 30 days and the initial activity is 10 times the allowed safe level, after how many days will it become safe to enter the room?
• For the reversible reaction A2 + B2 ⇌ 2AB, the activation energies are 180 kJ mol⁻¹ for the forward direction and 200 kJ mol⁻¹ for the reverse direction. If a catalyst reduces the activation energy of both directions by 100 kJ mol⁻¹, what will be the enthalpy change of the reaction A2 + B2 ⇌ 2AB in the catalyzed pathway (in kJ mol⁻¹)?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →