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3 years ago

15

Please help me with chem, it would be very appreciated!

1 answer:

Lelu [443]3 years ago

5 0

To determine the shapes of molecules, we must become acquainted with the Lewis electron dot structure. Although the Lewis theory does not determine the shapes of molecules, it is the first step in predicting shapes of molecules. The Lewis structure helps us identify the bond pairs and the lone pairs.

Please mark BRAINLIEST.

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The electron configuration of an element is 1s2 2s2. How many valence electrons does the element have?

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Answer:

Two valence electrons

Explanation:

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Match the scientists to their contributions to the development of the periodic table.

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Where are angora goats found

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3 years ago

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Calculate the concentration (M) of sodium ions in a solution made by diluting 25.0 mL of a 0.765 M solution of sodium sulfide to

Yuri [45]

<u>Given:</u>

Concentration of Na₂S = 0.765 M

Volume of Na₂S solution = 25.0 ml = 0.025 L

Final total volume = 225 ml = 0.225 L

<u>To determine:</u>

The concentration of Na+ ions

<u>Explanation:</u>

# moles of Na₂S = 0.765 * 0.025 = 0.0191 moles

Based on the atomic stoichiometry of Na₂S-

# moles of Na⁺ ions = 2*0.0191 = 0.0382 moles

conc of Na⁺ ions = 0.0382 moles/ 0.225 L = 0.169 M

Ans: [Na⁺] = 0.169 M

5 0

3 years ago

Read 2 more answers

At a certain temperature, the K p Kp for the decomposition of H 2 S H2S is 0.746 0.746 . H 2 S ( g ) − ⇀ ↽ − H 2 ( g ) + S ( g )

Ivanshal [37]

<u>Answer:</u> The total pressure of container at equilibrium is 0.431 bar

<u>Explanation:</u>

We are given:

Pressure of hydrogen sulfide = 0.240 bar

The given chemical equation follows:

$H_2S(g)\rightleftharpoons H_2(g)+S(g)$

<u>Initial:</u> 0.240

<u>At eqllm:</u> 0.240-x x x

The expression of $K_p$ for above equation follows:

$K_p=\frac{p_{H_2}\times p_S}{p_{H_2S}}$

We are given:

$K_p=0.746$

Putting values in above expression, we get:

$0.746=\frac{x\times x}{0.240-x}\\\\x=0.191,-0.940$

Neglecting the negative value of 'x' because pressure cannot be negative.

So, the equilibrium pressure of hydrogen gas = x = 0.191 bar

The equilibrium pressure of sulfur gas = x = 0.191 bar

The equilibrium pressure of hydrogen sulfide gas = (0.240 - x) = (0.240 - 0.191) = 0.049 bar

Total pressure of the container at equilibrium = $p_{H_2}+p_{S}+p_{H_2S}$

Total pressure of the container at equilibrium = 0.191 + 0.191 + 0.049 = 0.431 bar

Hence, the total pressure of container at equilibrium is 0.431 bar

6 0

4 years ago