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maggiestevens5321
26.06.2019 •
Chemistry
If the rate of a reaction increases by a factor of 64 when the concentration of reactant increases by a factor of 4, what is the order of the reaction with respect to this reactant?
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Ответ:
The reaction is of order three with respect to the reactant.
ExplanationThe rate of a reaction of order n about a certain reactant is proportion to the concentration of that reactant raised to the n-th power. This is true only if concentrations of any other reactants stay constant in the whole process.
In other words, Rate = constant × [Reactant]ⁿ, Rate ∝ [Reactant]ⁿ. (The symbol "∝" reads "proportional to".)
In this question,
[4 × Reactant]ⁿ ÷ [Reactant]ⁿ = 64.
In other words, 4ⁿ = 64, where n is the order of the reaction with respect to this reactant.
It might take some guesswork to find the value of n. Alternatively, n can be solved directly with a calculator using logarithms. Taking natural log of both sides:
Evaluating
on Google or on a calculator with support for ln (the natural log) will give the value of n- no guesswork required.
n = 3. Therefore, the reaction is of order three with respect to this reactant.
Ответ:
For A: The average molecular speed of Ne gas is 553 m/s at the same temperature.
For B: The rate of effusion of
gas is ![1.006\times 10^{-3}mol/hr](/tpl/images/1364/7253/62a4e.png)
Explanation:
For A:
The average molecular speed of the gas is calculated by using the formula:
OR
where, M is the molar mass of gas
Forming an equation for the two gases:
Given values:
Plugging values in equation 1:
Hence, the average molecular speed of Ne gas is 553 m/s at the same temperature.
For B:
Graham's law states that the rate of diffusion of a gas is inversely proportional to the square root of the molar mass of the gas. The equation for this follows:
Where, M is the molar mass of the gas
Forming an equation for the two gases:
Given values:
Plugging values in equation 2:
Hence, the rate of effusion of
gas is ![1.006\times 10^{-3}mol/hr](/tpl/images/1364/7253/62a4e.png)