Chemistry, 21.04.2020 16:40 briizy

In their notebook you see that it takes 9 hours for a sixth of a 0.5M solution of BC2 to react. Unfortunately, you have somewhere you need to be in 3.5 hours and will not be able to monitor the reaction properly. What concentration of BC2 should you originally use in order to have 0.42 M remaining in 3.5 hours

Answers: 2

Show answers

Answers

Answer from: jordanmazer17

Complete Question

The complete question is shown on the first uploaded image

The concentration of BC_2 that should used originally is C_Z_o = 0.4492M

Explanation:

From the question we are told that

The necessary elementary step is

2BC_2 -----4C + B_2

The time taken for sixth of 0.5 M of reactant to react t = 9 hr

The time available is t_a = 3.5 hr

The desired concentration to remain C = 0.42M

Let Z be the reactant , Y be the first product and X the second product

Generally the elementary rate law is mathematically as

$-r_Z = kC_Z^2 = - \frac{d C_Z}{dt}$

Where k is the rate constant , C_Z is the concentration of Z

From the elementary rate law we see that the reaction is second order (This because the concentration of the reactant is raised to power 2 )

For second order reaction

$\frac{1}{C_Z} - \frac{1}{C_Z_o} = kt$

Where C_Z_o is the initial concentration of Z which a value of C_Z_o = 0.5M

From the question we are told that it take 9 hours for the concentration of the reactant to become

$C_Z = C_Z_o - \frac{1}{6} C_Z_o$

$C_Z = 0.5 - \frac{0.5}{6}$

= 0.4167 M

$\frac{1}{0.4167} - \frac{1}{0.50} = 9 k$

0.400 = 9 k

=> $k = 0.044\ L/ mol \cdot hr^{-1}$

For C_Z = 0.42M

$\frac{1}{0.42} - \frac{1}{C_Z_o} = 3.5 * 0.044$

$2.38 - 0.154 = \frac{1}{C_Z_o}$

$2.226 = \frac{1}{C_Z_o}$

$C_Z_o = \frac{1}{2.226}$

C_Z_o = 0.4492M

In their notebook you see that it takes 9 hours for a sixth of a 0.5M solution of BC2 to react. Unfo

Answer from: Quest

well in order to answer this question you have to provide more information < 3

Answer from: Quest

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .

Another question on Chemistry

Chemistry, 21.06.2019 23:30

Ihat will happen if i added baking soda to vinegar

Answers: 2

Answer

Chemistry, 22.06.2019 18:10

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate

Answers: 1

Answer

Chemistry, 22.06.2019 22:30

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.

Answers: 2

Answer

Chemistry, 23.06.2019 00:00

What is the approximate mass of 25 cm3 of silver, if the density is 10.5 g/cm3? a. 0.42 g b. 2.4 g c. 42 g d. 260 g

Answers: 1

Answer

You know the right answer?

In their notebook you see that it takes 9 hours for a sixth of a 0.5M solution of BC2 to react. Unfo...

Questions