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Sveta_85 [38]
3 years ago
6

Two substances A and B react with each other in such a way that one-half of A remains after 25 min and one-fourth of A remains a

fter 50 min. Doubling the concentration of B while keeping the concentration of A fixed doubles the rate of the reaction. This reaction is
a. first-order in both A and B.
b. second-order in A and first-order in B.
c. zero-order in both A and B.
d. first-order in A and second-order in B.
e. second-order in both A and B.
Chemistry
1 answer:
juin [17]3 years ago
3 0

Answer:

a. first-order in both A and B.

Explanation:

In order to determine the kinetics of reaction let us consider the given data

a) Doubling the concentration of B while keeping the concentration of A fixed doubles the rate of the reaction. : it means the reaction is first order reaction with respect to reactant B.

b) The half life is the time required to complete the reaction by half way.

As with time one half of A remains and after equal time one fourth of A remains it means again the order of reaction is first with respect to A also.

There is no effect on the half life if we are decreasing the initial concentration of A also.

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Iridium has only two naturally occurring isotopes. Ir-191 with arelative mass of 190.96058 and Ir-193 with a relative mass of192
OLEGan [10]

<u>Answer:</u> The fractional abundance of Ir-191 is 0.372

<u>Explanation:</u>

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i   .....(1)

Let the fractional abundance of Ir-191 be x and that of Ir-193 isotope be (1-x)

<u>For isotope 1 (Ir-191):</u>

Mass of isotope 1 = 190.96058 amu

Fractional abundance of Ir-191 = x

<u>For isotope 1 (Ir-193):</u>

Mass of isotope 1 = 192.96292 amu

Fractional abundance of Ir-193 = (1 - x)

Average atomic mass of iridium = 192.217 amu

Putting values in equation 1, we get:

192.217=[(190.96058\times x)+(192.96292\times (1-x))]\\\\x=0.372

Hence, the fractional abundance of Ir-191 is 0.372

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3 years ago
A solvent has a freezing point of 10°C. What is the most likely freezing point if 5 grams of Salt is mixed with the solvent? (AK
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Answer:

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Explanation:

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Hello, Thanks for making your post on brainly!

I would say the best answer is C)Mixture

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The periodic table is a systematic arrangement of elements in order of their atomic numbers into a set of 8 columns each called groups and a set of 7 rows each called a period.

Elements are arranged in different groups according to the number of Valence electrons they have.

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