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3 years ago

Cómo se expresan las concentraciones en una solución?

Chemistry

1 answer:

11Alexandr11 [23.1K]3 years ago

6 0

yo no ablo espanol pero si ablo English

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Which of the following best shows two element combining to form a compound

marshall27 [118]

Answer:

there are no examples but 1 example is H2O which has 2 elements combining a compound.

Explanation:

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3 years ago

Which of the following best describes the formation of plasma?

Sav [38]

I say, D is the answer

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3 years ago

Consider the mechanism. step 1:step 2:overall:2a⟶bb c⟶d2a c⟶dslowfast determine the rate law for the overall reaction, where the

Ne4ueva [31]

Answer:

Rate: R = k [A]²

Explanation:

The rate law equation for a given complex chemical reaction is given as the product of molar concentrations of the reactant raised to the power their respective partial reaction orders. The sum of the partial reaction orders is equal to the overall order of reaction.

For a complex reaction, the rate law is generally determined by the slowest step, which is known as the rate-determining step.

Given reaction mechanism:

Step 1: 2 A⟶ B, slow step

Step 2: B+ C⟶ D, fast step

Overall: 2 A + C ⟶ D

In this given reaction mechanism, the step 1 is the slow step and thus the rate determining step.

Therefore, the rate law for the given mechanism is:

Rate: R = k [A]²

Here, k is the overall rate constant

Also, the overall order of the reaction = 2

Therefore, the given chemical reaction is said to be second order reaction.

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3 years ago

Why is it important to heat analytical reagents and store them in a dessicated atmosphere before use?

schepotkina [342]

Explanation:

In normal atmosphere, analytical reagents may absorb water molecules that may affect the results of chemical reactions. So, in order to get accurate results from these analytical regents, they must be stored in a dessicated atmosphere or heated before being used so that the water molecules must dry away.

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3 years ago

A 0.334 g sample of an unknown compound occupies 245 ml at 298 K and 1.22 atm. What is the molar mass of the unknown compound.

marysya [2.9K]

Answer:

27.4 g/mol

Explanation:

Assuming the compound is a gas and that it behaves ideally, we can solve this problem by using the PV=nRT formula, where:

P = 1.22 atm

V = 245 mL ⇒ 245 mL / 1000 = 0.245 L

n = ?

R = 0.082 atm·L·mol⁻¹·K⁻¹

T = 298 K

Inputting the data:

1.22 atm * 0.245 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298 K

Solving for n:

n = 0.0122 mol

With the calculated number of moles and given mass, we calculate the molar mass:

0.334 g / 0.0122 mol = 27.4 g/mol

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3 years ago

Cómo se expresan las concentraciones en una solución?​

Cómo se expresan las concentraciones en una solución?