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olya-2409 [2.1K]

4 years ago

6

Which of the following best describes what a catalyst does?

1 answer:

aleksandrvk [35]4 years ago

3 0

A catalysts lowers activation energy

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Which of the following best describes the relationship between air temperature and relative humidity?

N76 [4]

Answer:

D

Explanation:

4 0

3 years ago

Problem PageQuestion Iron(III) oxide and hydrogen react to form iron and water, like this: (s)(g)(s)(g) At a certain temperature

Marrrta [24]

Complete question

The complete question is shown on the first uploaded image

Answer:

The value is $K_c = 2.69 *10^{-5}$

Explanation:

From the question we are told that

The equation is

$Fe_20_3_{(s)}+3H_{(g)}\to2Fe_{(s)}+3H_2O_{(g)}$

Generally the equilibrium is mathematically represented as

$K_c = \frac{[H_2O]^2}{[H_2]^3}$

Here $[H_2O]$ is the concentration of water vapor which is mathematically represented as

$[H_2O ] = \frac{n_w}{V_s }$

Here $V_s$ is the volume of the solution given as 8.9 L

$n_w$ is the number of moles of water vapor which is mathematically represented as

$n_w = \frac{m_w}{Z_w}$

Here $m_w$ is the mass of water given as 2.00 g

and $Z_w$ is the molar mass of water with value 18 g/mol

So

$n_w = \frac{2}{18}$

=> $n_w = 0.11 \ mol$

So

$[H_2O ] = \frac{0.11}{8.9 }$

=> $[H_2O ] = 0.01236 \ M$

Also

$[H]$ is the concentration of hydrogen gas which is mathematically represented as

$[H ] = \frac{n_v}{V_s }$

Here $V_s$ is the volume of the solution given as 8.9 L

$n_v$ is the number of moles of hydrogen gas which is mathematically represented as

$n_v = \frac{m_v}{Z_v}$

Here $m_w$ is the mass of water given as 4.77 g

and $Z_v$ is the molar mass of water with value 2 g/mol

So

$n_w = \frac{4.77}{2}$

=> $n_w = 2.385 \ mol$

So

$[H_2O ] = \frac{2.385}{8.9 }$

=> $[H_2O ] = 0.265 \ M$

So

$K_c = \frac{( 0.01236 )^3}{ (0.265 )^2}$

=> $K_c = 2.69 *10^{-5}$

7 0

3 years ago

Describe how to make a solution of 10 grams of salt in 100 grams of water

UNO [17]

Answer more points plz

Explanation:

8 0

4 years ago

A. Which of the following chemical formulas are incorrect? Select all that apply.

alexandr1967 [171]

Answer:

The answer to your question is:

Explanation:

Formulas given Status Correct formulas

NaO₂ Incorrect Na₂O

RbCl Correct

K₂S Correct

Al₂Cl₃ Incorrect AlCl₃

MgP₂ Incorrect Mg₃P₂

6 0

3 years ago

Pls help me with this question!!

musickatia [10]

Maybe it’s c I’m not sure

6 0

3 years ago

Read 2 more answers