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3 years ago

Urgent !!!!

Chemistry

2 answers:

saul85 [17]3 years ago

5 0

Answer:its y

Explanation:its going down with the most force, the end of the hill is the fastest if that makes sense

NikAS [45]3 years ago

4 0

Answer:

point y

Explanation:

hope it helps but the guy above me is smarter mark him the brainliest :D

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Copper(11) sulfate is a bluish color. If you could choose between a red wavelength of a blue wavelength

rodikova [14]

Answer:

Explanation:

i would choose blue cause its a nice color and its my favorite color

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3 years ago

In standardizing a potassium hydroxide solution, a student finds that 32.60 mL of the base solution is needed to titrate 0.5045

grandymaker [24]

Answer:

chemistry

Explanation:

In standardizing a potassium .hydroxide solution, a student finds that 32.60mL of the base solution is needed to titrate 0.5045 grams of KHP to a phenolphthalein endpoint. In another titration, 26.63mL of this same base solution is needed to titrate 0.2003grams of an unknown solid monoprotic acid.

<h2>pls, branliest! :)</h2>

8 0

3 years ago

What is the numerical value of the equilibrium constant Kc?

Nezavi [6.7K]

ANSWER

EXPLANATION

Given that;

The number of moles of NH3 is 3 moles

The number of moles of H2 is 1 mole

The number of moles of N2 is 2 moles

At equilibrium, the concentration of ammonia is 1.4 moles/L

To find the value of Kc, follow the steps below

Step 1: Write the balanced equation of the reaction

$\text{ N}_{2(g)}\text{ + 3H}_{2(g)}\text{ }\rightleftarrows\text{ 2NH}_{3(g)}$

Step 2: Write the equation of the reaction in terms of Kc

$\text{ K}_C\text{ = }\frac{[\text{ NH}_3]^2}{[N_2]\text{ \lbrack H}_2]^3}$

Step 3: Find the concentration of each reactant at equilibrium using a stoichiometry ratio

From the reaction above, you will see that 1 mole of Nitrogen reacts with 3 moles of hydrogen to give 2 moles of ammonia.

Let x represents the concentration of nitrogen at equilibrium

Recall, that the concentration of ammonia at equilibrium is 1.4 moles/L

$\begin{gathered} \text{ 2 mole NH}_3\text{ }\rightarrow\text{ 1 mole N}_2 \\ \text{ 1.04 mole/L NH}_3\text{ }\rightarrow\text{ x moles/L N}_2 \\ \text{ cross multiply} \\ \text{ 2 moles NH}_3\times\text{ x moles/L N}_2\text{ = 1 mole N}_2\times1.4\text{ mol/L} \\ \text{ Isolate x} \\ \text{ x mol/L N}_2\text{ = }\frac{1\text{ moles N}_2\times1.41\cancel{\frac{mol}{L}}}{2\cancel{moles}} \\ \text{ x mol/L = }\frac{1.04}{2} \\ \text{ x= 0.52 mole/L} \end{gathered}$

Since the initial number of moles of nitrogen is 1 mole, hence, the concentration of nitrogen at equilibrium is calculated below as

Concentration at equilibrium = 1 -0.52

Concentration of nitrogen at equilibrium = 0.48 mole/L

The next step is to find the concentration of hydrogen at equilibrium

Let y represent the mole of hydrogen at equilibrium

$\begin{gathered} \text{ 2 moles NH}_3\rightarrow\text{ 3 moles H}_2 \\ \text{ 1.04 moles/L NH}_3\text{ }\rightarrow\text{ y moles/L H}_2 \\ \text{ cross multiply} \\ \text{ 2 moles NH}_3\times\text{ y moles/L H}_2\text{ = 1.04 moles/L NH}_3\times3\text{ moles H}_2 \\ \text{ Isolate y} \\ \text{ y moles/L H}_2\text{ = }\frac{1.04\cancel{\frac{moles}{L}}NH_3\times3mole\text{ H}_2}{2\cancel{molsNH_3}} \\ y\text{ = }\frac{1.40\times3}{2} \\ \text{ y = }\frac{3.12}{2} \\ \text{ y = 1.56 moles} \end{gathered}$

Since the initial concentration of hydrogen is 2 moles, hence the concentration of hydrogen at equilibrium can be calculated below as

Concentration at equilibrium = 2 - 1.56

Concentration at equilibrium = 0.44 mole/L

Step 4: Find the value of Kc using the equation in step 2

$\text{ Kc = }\frac{[NH_3]^2}{[N_2]\text{ \lbrack H}_2]^3}$ $\begin{gathered} \text{ Kc = }\frac{1.04^2}{0.48\times0.44^3} \\ \\ \text{ K}_c=\text{ }\frac{1.0816}{0.48\times\text{ 0.085184}} \\ \\ \text{ kc = }\frac{1.0816}{0.0408832} \\ \text{ kc = 26.4558547276} \end{gathered}$

Hence, the value of Kc is 26

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2 years ago

Give me 3 facts and 3 superstitious about the moon

PolarNik [594]

Facts:

1. The Moon has no atmosphere

2. The Moon has quakes

3. The Moon is a dusty ball of rock, measuring 3,476km in diameter

Superstitions :

1. Gazing too long at the full moon will bring out one’s inner lunatic.

2. The waxing of a new moon is the best time for sowing seeds, weddings, childbirth, new projects and travel.

3. It is bad luck to see the new moon, for the first time of the night, through glass or tree branches.

Hope this helps and if it does, don't be afraid to give my answer a "Thanks" and maybe a Brainliest if it's correct?

6 0

3 years ago

Read 2 more answers

H2SO4(aq)+NaOH(s)> (neutralization of both acidic protons)

RUDIKE [14]

H2SO4(aq)+NaOH(s)----->NA2SO4 + H20

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3 years ago