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3 years ago

Which of the following is the algebraic expression that best describe the sequence?

Chemistry

1 answer:

Bas_tet [7]3 years ago

3 0

Algebraic expression: It is an expression which is frame from the variables (x,y etc.), integer constants and algebraic operations (+,- , multiplication and division etc.).

Sequence is defined as the structured list of numbers.

Now, according to the given sequence, first place is $\frac{1}{7}$ , second is $\frac{2}{7}$ , third is $\frac{3}{7}$ , fourth is $\frac{4}{7}$ . Thus, $x^{th}$ place of the sequence should be determined.

The $x^{th}$ place of the sequence is $\frac{x}{7}$ . Therefore, option (A) is correct.

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Phosphorus pentachloride decomposes according to the chemical equation PCl 5 ( g ) − ⇀ ↽ − PCl 3 ( g ) + Cl 2 ( g ) K c = 1.80 a

mezya [45]

Answer:

See explanation for answer

Explanation:

First, let's write the equation again:

PCl5 <---------> PCl3 + Cl2 Kc = 1.8

The expression for equilibrium is the following:

Kc = [PCl3] [Cl2] / [PCl5]

We only know the data for PCl5 at the beggining, and to solve this, we need to write what happens before and after the reaction.

At first, we only have the 0.342 moles of PCl5 and nothing of the products. This is logic, because there is no reaction yet.

Concentration of PCl5 at this point (With a volume of 3.65 L) is:

[PCl5] = 0.342 / 3.65 = 0.094 M

Keep in mind, that this is not the concentration in equlibrium. This is only the concentration at the beggining. To know it's concentration in equilibrium, we'll do the following:

PCl5 <---------> PCl3 + Cl2 Kc = 1.8

i) 0.094 0 0

eq) 0.094 - x x x

Now, we will replace this values in the equilibrium equation:

1.8 = x * x / 0.094 - x

Solving for x we have:

1.8(0.094 - x) = x²

0.1692 - 1.8x = x²

x² + 1.8x - 0.1692 = 0

Using the general equation for x we have:

x = -1.8 ± √(1.8)² - 4 * 1 * (-0.1692) / 2

x = -1.8 ± √3.9168 / 2

x = -1.8 ± 1.98 / 2

x1 = -1.8 + 1.98 / 2 = 0.09

x2 = -1.8 - 1.98 / 2 = -1.89

This means that the value of x is 0.09 therefore, the concentrations in equilibrium for each species is:

[PCl5] = 0.094 - 0.09 = 0.04 M

[PCl3] = [Cl2] = 0.09 M

7 0

4 years ago

2.... What must all organic compounds contain? H-O-P <br> 0-S-N <br> C-H-O <br>K-O-H

andreev551 [17]

Answer:

C-H-O is the answer for this one

3 0

4 years ago

Read 2 more answers

if you are told to get 100 mL of stock solution to use to prepare smaller size sample for an experiment, which piece of glasswar

fgiga [73]

Answer:

A beaker

Step-by-step explanation:

Specifically, I would use a 250 mL graduated beaker.

A beaker is appropriate to measure 100 mL of stock solution, because it's easy to pour into itscwide mouth from a large stock bottle.

You don't need precisely 100 mL solution.

If the beaker is graduated, you can easily measure 100 mL of the stock solution.

Even if it isn't graduated, 100 mL is just under half the volume of the beaker, and that should be good enough for your purposes (you will be using more precise measuring tools during the experiment).