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4 years ago

The energy level has the lowest energy.

Chemistry

1 answer:

zubka84 [21]4 years ago

6 0

Answer:

Radio waves are the lowest source of energy

Explanation:

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The 1995 Nobel Prize in Chemistry was shared by Paul Crutzen, F. Sherwood Rowland, and Mario Molina for their work concerning th

horrorfan [7]

Answer:

The enthalpy of reaction for the reaction of chlorine with ozone is -162.5 kJ.

Explanation:

$ClO ( g ) + O_3 ( g )\rightarrow Cl ( g ) + 2 O_2 ( g ),\Delta H^o_{1,rxn} =-122.8 kJ$ ..[1]

$2 O_3 ( g )\rightarrow 3O_2 ( g ),\Delta H^o_{2,rxn} = -285.3 kJ$ ..[2]

$O_3(g) + Cl(g)\rightarrow ClO (g)+O_2(g),\Delta H^o_{3,rxn}=?$ ..[3]

The enthalpy of reaction for the reaction of chlorine with ozone can be calculated by using Hess's law:

[2] - [1] = [3]

$\Delta H^o_{3,rxn}=\Delta H^o_{2,rxn}-\Delta H^o_{1,rxn}$

$=-285.3 kJ-(-122.8 kJ)=162.5 kJ$

The enthalpy of reaction for the reaction of chlorine with ozone is -162.5 kJ.

8 0

3 years ago

You are managing a city that needs to upgrade its disinfection basin at your 40 MGD surface water drinking water treatment plant

nignag [31]

Solution :

According to Chick's law

$\frac{N_t}{N_0}=e^{-k'C^n t}$

where, t = contact time

c = concentration of disinfectant

k' = lethality coefficient = 4.71

n = dilution coefficient = 1

4 log removal = % removal = 99.99

$\frac{N_t}{N_0}=\frac{\text{bacteria remaining}}{\text{bacteria initailly present}}$

= 1 - R

= 1 - 0.9999

Now for plug flow reactor contact time,

$\tau =\frac{V}{Q} =\frac{75000}{40 \times 10^6}$

= 0.01875 days

= 27 minutes

For CSTR, $\tau =\frac{V}{Q} =\frac{150000}{40 \times 10^6}$

$=3.75 \times 10^{-3}$ days

= 5.4 minute

There are 3 reactors, hence total contact time = 3 x 5.4

= 16.2 minute

Or $\frac{N_t}{N_0}=e^{-k'C^n t}$

or $(1-0.9999)=e^{-4.71 \times C \times t}$

∴ C x t = 1.955

For PFR, $t_1 = 27$ min

∴ C $=\frac{1.955}{27}$ = 0.072 mg/L

For CSIR, $t_2=16.2$ min

$C=\frac{1.955}{16.2} = 0.1206$ mg/L

∴ Chlorine required for PFR in kg/day

$=\frac{0.072 \times 40 \times 10^6 \times 3.785}{10^6}$ (1 gallon = 3.785 L)

= 18.25 kg/day

Therefore we should go for PFR system.

3 0

3 years ago

Which piece of glassware shown below is used to hold and dispense a solution of known concentration during a titration?

Musya8 [376]

Answer:

Answer C

Explanation:

Got it off of q**zlet ;)

4 0

3 years ago

A suspension is an example of a _____.

Harman [31]

Answer:

The answer is heterogeneous mixture i think..

5 0

3 years ago

What determines gravitational pull?

vlabodo [156]

Hello there!

From my calculations the answers are:

D. Mass

B. Gravity

B. Gravity

Hope This Helps You!
Good Luck :)

8 0

3 years ago