1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Stolb23 [73]
2 years ago
9

under certain water​ conditions, the free chlorine​ (hypochlorous acid,​ hocl) in a swimming pool decomposes according to the la

w of uninhibited decay. after shocking a​ pool, the pool​ boy, geoff, tested the water and found the amount of free chlorine to be 2.6 parts per million​ (ppm). twenty-four hours​ later, geoff tested the water again and found the amount of free chlorine to be 2.1 ppm. what will be the reading after 2 days​ (that is, 48 ​hours)
Chemistry
1 answer:
ivolga24 [154]2 years ago
5 0

Answer:

1.7 ppm

Explanation:

Original amount N' = 2.6 ppm

time to testing t = 24 hr

final amount N = 2.1 ppm

Using exponential inhibited decay, we have

N = N'e^(-kt)

Where

N is the new reading

N' is the original reading

t is the decay time

k is the decay constant

Substituting, we have

2.1 = 2.6 x e^(-k x 24)

2.1 = 2.6 x e^(-24k)

0.808 = e^(-24k)

We take the natural log of both sides of the equation

Ln 0.808 = Ln (e^(-24k))

-0.213 = - 24k

K = 0.213/24 = 0.00886

After 48 hrs, the reading of free chlorine will be

N = 2.6 x e^(-0.00886 x 48)

N = 2.6 x e^(-0.425)

N = 2.6 x 0.654

N = 1.7 ppm

You might be interested in
Diffusion is the movement of water between the cell membrane. <br>O True <br>O False​
jarptica [38.1K]

it is true good friend chip chip cherrio

3 0
2 years ago
Read 2 more answers
During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking
ss7ja [257]

Answer:

The equation is: CuCO3(s) → CuO(s) + CO2(g)

Explanation:

Copper carbonate decomposes at high temperatures, generating the products carbon dioxide (CO2) and copper oxide (II) CuO. In this type of decomposition reaction, a substance is broken generating two different compounds.

7 0
3 years ago
How do i solve number 36?
tresset_1 [31]
To cut this short and for your understanding, ionic bond is formed between metals (mostly right column in periodic table). Covalent bond is formed between non-metals (mostly left column in periodic table). So polar covalent is also a covalent bond but it is polar, which means the shape of molecules are not symmetrical hence maybe an atom in a molecule has most of the electron attracted to it causing itself to be partial negative (since electron are negatively charged) and the other atom has its electron being attracted by others became partial positive. Polar covalent can also be when H atom is binding either to F, O or N (also known as hydrogen bond).
6 0
2 years ago
What is the molar mass of CO2
mina [271]
Molar mass of CO2 = 44.01 g/mol
5 0
3 years ago
Somebody answer please a picture is attached!??
DanielleElmas [232]
9.2 that is the answer
7 0
2 years ago
Other questions:
  • How many molecules of HBr are present in 42.5 grams of HBr
    13·1 answer
  • Are mushroom producing spores asexual or sexual
    15·2 answers
  • In a first-order reaction, how does the rate change if the concentration of the reactant decreases to one-third its original val
    14·2 answers
  • The circumference of a circle is  feet. What is the length of the radius of this circle? 
    12·2 answers
  • Cities are measurably hotter than the surrounding suburbs
    6·2 answers
  • Alai is comparing the physical property of two materials. He is hitting each with a hammer to observe what happens. What physica
    15·2 answers
  • 17. What is the molarity of ZnCl2 that forms when 15 grams of Zn reacts completely with CuCl, if a
    13·1 answer
  • 117 milligrams (mg) of purified product was isolated from a chemical reaction. This experimental yield of product represents a 8
    12·1 answer
  • If 33.9 ml of h3po4 neutralizes 23.4 ml of 2.28 m koh, what is the molarity of the phosphoric acid?
    10·1 answer
  • Hey chemist tests new measures for paint samples and decides to one mixture stickiness makes it worthless. A scientist working i
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!