Question

From the kinetic theory, calculate the number of collisions per unit of time, per unit of volume at 600 K that occur between the molecules of H2 (M = 2 g / mol) and I2 (253.8 g / mol) and compare your result with the rate constant of this reaction, k = 5.71x10 ^ -4 M ^ -1 * s ^ -1. The concentrations of both gases is 1 M and the molecular diameters of hydrogen and nitrogen are 50 pm and 130 pm, respectively [1 pm = 10-12 m]

Answer 1

Answer 2

To calculate the number of collisions per unit of time, per unit of volume, we can use the collision frequency equation from the kinetic theory of gases:

Z = (1/4) * σ * √(8 * k * T / π * M)

where: Z is the collision frequency, σ is the effective collision cross-sectional area, k is the rate constant, T is the temperature in Kelvin, M is the molar mass of the molecules.

First, let's calculate the collision frequency for the H2 (hydrogen) molecules at 600 K:

M(H2) = 2 g/mol diameter(H2) = 50 pm = 50 * 10^(-12) m

We can calculate the effective collision cross-sectional area using the molecular diameter:

σ(H2) = π * (diameter(H2)/2)^2

Next, substitute the values into the collision frequency equation:

Z(H2) = (1/4) * σ(H2) * √(8 * k * T / π * M(H2)) = (1/4) * π * (25 * 10^(-12))^2 * √(8 * (5.71 * 10^(-4)) * 600 / π * 2)

Now, let's calculate the collision frequency for the I2 (iodine) molecules at 600 K:

M(I2) = 253.8 g/mol diameter(I2) = 130 pm = 130 * 10^(-12) m

Calculate the effective collision cross-sectional area:

σ(I2) = π * (diameter(I2)/2)^2

Substitute the values into the collision frequency equation:

Z(I2) = (1/4) * σ(I2) * √(8 * k * T / π * M(I2)) = (1/4) * π * (65 * 10^(-12))^2 * √(8 * (5.71 * 10^(-4)) * 600 / π * 253.8)

Now, let's calculate the rate constant (k) for the reaction:

k = 5.71 * 10^(-4) M^(-1) * s^(-1)

The concentration of both gases is 1 M.

Now we can compare the collision frequency with the rate constant to determine their relationship.

Please note that I've made assumptions about the given values and used the provided formulas to calculate the collision frequencies.