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3 years ago

Help! Will mark brainliest! Explain why a mechanical wave does not exist in a vacuum.

1 answer:

7 0

<span> Light waves are a wave in the electromagnetic field, this field may exist in a vacuum. Sound needs either solid, liquid, or gas to propagate and therefore it is called a mechanical wave. Sound is a form of energy which is transferred by vibrating air molecules if motions of propagation is air.</span>

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Consider the following reaction at a high temperature. Br2(g) ⇆ 2Br(g) When 1.35 moles of Br2 are put in a 0.780−L flask, 3.60 p

UNO [17]

Answer : The equilibrium constant $K_c$ for the reaction is, 0.1133

Explanation :

First we have to calculate the concentration of $Br_2$ .

$\text{Concentration of }Br_2=\frac{\text{Moles of }Br_2}{\text{Volume of solution}}$

$\text{Concentration of }Br_2=\frac{1.35moles}{0.780L}=1.731M$

Now we have to calculate the dissociated concentration of $Br_2$ .

The balanced equilibrium reaction is,

$Br_2(g)\rightleftharpoons 2Br(aq)$

Initial conc. 1.731 M 0

At eqm. conc. (1.731-x) (2x) M

As we are given,

The percent of dissociation of $Br_2$ = $\alpha$ = 1.2 %

So, the dissociate concentration of $Br_2$ = $C\alpha=1.731M\times \frac{1.2}{100}=0.2077M$

The value of x = 0.2077 M

Now we have to calculate the concentration of $Br_2\text{ and }Br$ at equilibrium.

Concentration of $Br_2$ = 1.731 - x = 1.731 - 0.2077 = 1.5233 M

Concentration of $Br$ = 2x = 2 × 0.2077 = 0.4154 M

Now we have to calculate the equilibrium constant for the reaction.

The expression of equilibrium constant for the reaction will be :

$K_c=\frac{[Br]^2}{[Br_2]}$

Now put all the values in this expression, we get :

$K_c=\frac{(0.4154)^2}{1.5233}=0.1133$

Therefore, the equilibrium constant $K_c$ for the reaction is, 0.1133

7 0

3 years ago

3k + 9 = 18 , find k

bearhunter [10]

Answer:

Explanation:

Collect like terms and divide by the coefficient of k

3 0

3 years ago

Read 2 more answers

Can someone help me please? (attached pic)

LenaWriter [7]

The answer is D, do you want me to show you how?

6 0

3 years ago

The proccess of melting is also called cooling???

lesya692 [45]

Becouse melting point and cooling point are two opposite things one is 100degrees nd other 0degrees

5 0

3 years ago

Which of the following quantum number combinations is not allowed in a ground-state atom?

ollegr [7]

The third option. The angular quantum number ( $l$ ) can be any integer between 0 and $n-1$ . Therefore, for the third option, $l$ can be 0, 1, 2, 3, or 4—but not 5.

7 0

3 years ago