Question

Рассчитайте, во сколько раз изменится (увеличится или уменьшится) скорость химической реакции в газовой фазе при изменении температуры от 450 до 480 градусов, если температурный коэффициент скорости реакции равен 2.

Answer 1

По правилу Вант-Гоффа: v2/v1=y^(T2-T1)/10, где v1, v2 - скорость реакции, y - температурный коэффициент скорости.
 v2/v1=2^(480-450)/10=2^3=8
Ответ: в 8 раз.

Answer 2

Calculation of the Change in Reaction Rate with Temperature

To calculate the change in the speed of a chemical reaction in the gas phase when the temperature changes from 450 to 480 degrees Celsius, we need to use the temperature coefficient of the reaction rate. In this case, the temperature coefficient is given as 2.

The temperature coefficient (Q10) is defined as the factor by which the reaction rate changes for every 10-degree Celsius increase in temperature. It can be calculated using the formula:

Q10 = (rate at T2 / rate at T1) ^ (1 / (T2 - T1) * 10)

Where: - T1 is the initial temperature (450 degrees Celsius) - T2 is the final temperature (480 degrees Celsius) - rate at T1 is the reaction rate at T1 - rate at T2 is the reaction rate at T2

Since we don't have the actual reaction rate values, we can't calculate the exact change in the reaction rate. However, we can still determine the relative change in the reaction rate by using the temperature coefficient.

Using the given temperature coefficient of 2, we can calculate the relative change in the reaction rate as follows:

Relative Change = Q10 ^ ((T2 - T1) / 10)

Substituting the values: - T1 = 450 degrees Celsius - T2 = 480 degrees Celsius - Q10 = 2

Relative Change = 2 ^ ((480 - 450) / 10)

Calculating the relative change:

Relative Change = 2 ^ (30 / 10) = 2 ^ 3 = 8

Therefore, the speed of the chemical reaction in the gas phase will increase by a factor of 8 when the temperature changes from 450 to 480 degrees Celsius, assuming a temperature coefficient of 2.

Please note that the actual change in the reaction rate may vary depending on the specific reaction and its rate equation. The given temperature coefficient is a hypothetical value used for this calculation.