A student takes a stock solution that is 50 mM (solute formula weight is 120.5 g/mol) and prepares a series of solutions. The first solution is made by diluting 1 mL of the stock in water to a final volume of 15 mL (sample 1). They then take a 2 mL aliquot of sample 1 and dilute in water to a final volume of 25 mL (sample 2). Finally, they take a 1.5 mL aliquot of sample 2 and dilute to a final volume of 250 mL. Calculate the final molar concentration for the analyte in molarity, molality, ppm, and ppb. State any assumptions.

Answers

Answer 1

Answer:

1.6x10⁻⁶M

1.6x10⁻⁶m

0.1928ppm

192.8ppb

Explanation:

The first dilution of the solution is from 1mL to 15mL. The second from 2mL to 25mL and the third from 1.5mL to 250mL. That means molarity is:

50mM =

0.050M * (1mL / 15mL) * (2mL / 25mL) * (1.5mL / 250mL) = 1.6x10⁻⁶M

Molality is defined as the ratio between moles and kg. Assuming the density of the solution is 1kg/L, molality is 1.6x10⁻⁶m

ppm is the ratio between milligrams and Liters:

1.6x10⁻⁶mol / L * (120.5g /mol) * (1000mg / g) = 0.1928mg/L = 0.1928ppm

And ppb = 1000*ppm;

0.1928ppm*1000 = 192.8ppb


Related Questions

The atomic number of an atom is always equal to the total number of
A. neutrons in the nucleus
B. protons in the nucleus
C. neutrons plus protons in the atom
D. protons plus electrons in the atom

Answers

C is correct. Have a good day!

Answer:

yep C is correct!!

Explanation:

what are the sources of error of electroplating?​

Answers

Answer:

electroplating is host to several defects due to the complexity of the process. Common electroplating defects often include issues that are present before plating, such as cold shuts, pitting, sharp edges, cleavage points and unclean manufacturing. During plating, flaking or a loss of adhesion can occur.

Explanation:

The reactants of two chemical equations are listed.
Equation 1: AgNO3 + Zn
Equation 2: AgNO3 + MgCl2
Based on the type of reaction, which reaction can be used to extract silver metal from silver nitrate solution?

Answers

Answer: Equation 1, because Zn being more reactive, replaces Ag from AgNO3

Explanation: I got it right on the quiz and it replaces it

How many total oxygen (O) atoms are present in the reactants side of the equation
C2H20H + 302 – 2002 + 3H20?
2

Answers

Answer:

there are 7 total oxygen (O) atoms are present in in the reactants side of the equation

When I freeze a water bottle and it breaks open is it because the ice has more matter than the water inside?

Answers

Yes you are right my friend expect a 100%

Some fireplace logs (commercially made) burn with a red and/or green flame. Using the information in this experiment, what elements could be responsible for these colored flames?

Answers

Answer:

Because each element has an exactly defined line emission spectrum, scientists are able to identify them by the color of flame they produce. For example, copper produces a blue flame, lithium, and strontium a red flame, calcium an orange flame, sodium a yellow flame, and barium a green flame. When you heat an atom, some of its electrons are "excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. ... The different mix of energy differences for each atom produces different colors. Each metal gives a characteristic flame emission spectrum

The normal boiling point of a certain liquid X is 141.70 °C, but when 68.1 g of barium hydroxide (Ba(OH)) are dissolved in 750. g of X the solution boils at 142.5C instead. Use this information to calculate the molal boiling point elevation constant

Answers

Answer:

Explanation:

Normal boiling point = 141.7°C

Elevated boiling point = 142.5°C

Elevation of boiling point Δt = 0.8°C

Formula for elevation of boiling point is as follows .

Δt = 1000 x Kb x w / (MW )

where w is weight of solute , M is molecular weight of solute , W is weight of solvent in grams,  Kb is molal boiling point elevation constant .

Mol weight of barium hydroxide = 171 .

.8 = 1000 x Kb x 68.1 / (171 x 750 )

Kb = 1.5°C / m

Does sugar make children hyperactive?

Answers

Answer:

yes it does

Explanation:

Answer:

Yes

Explanation:

Trust me I know :/

Which statement gives a disadvantage of multicellular organisms?


A. They need small amounts of energy


B. They reproduce slower than unicellular organisms


C. They can perform more functions


D. Cells are able to provide support

Answers

Answer: B. They reproduce slower than unicellular organisms

Explanation:

In unicellular organisms there is a single cell which performs all the functions like digestion, respiration, and reproduction. The cell reproduce by cell division. The single parent cell divides into two identical daughter cells. But multicellular organisms exhibit multiple cells and their reproduction is complex. They reproduce by sexual mode of reproduction in which separate sex cells are produced when they fuse form zygote which is the precursor of new organism. This process is slower than that of the cell division and production of progeny by the unicellular organisms. Thus reproduction is slower in multicellular organism this is the disadvantage in multicellular organisms.

Answer:

B. they reproduce slower than unicellular organisms

Explanation:

Heat moves from what source by convection and radiation?

Answers

Answer:

heat can move from any source but if we are being legitimate it moves from convection

Explanation:

Which factors directly affect the magnetic force produced by an electromagnet?

O number of turns in the wire, amount of current

O amount of current, type of force

O length of core, number of turns in the wire

O amount of current, length of core

Answers

It’s o amount of current,type of force
o mount of current type of force

The ozone "hole" over Antarctica formed as the result of a series of chemical reactions. The loss occurs in part through three consecutive steps in which ozone is broken down: Step 1: Chlorine atoms react with ozone (O3) to form chlorine monoxide and molecular oxygen. Step 2: Chlorine monoxide molecules combine to form ClOOCl gas Step 3: ClOOCl absorbs sunlight and breaks into chlorine atoms and molecular oxygen. a) Write a balanced equation for each step. b) Write an overall balanced equation for the sequence

Answers

Answer:

A)

Cl + O3 --> ClO + O2

2ClO --> ClOOCl

ClOOCl --> 2 Cl + O2

B)

Cl2 + 4O3 -> 2 ClO + 5O2

Explanation:

Step 1: Chlorine atoms react with ozone (O3) to form chlorine monoxide and molecular oxygen

Cl + O3 --> ClO + O2

Step 2: Chlorine monoxide molecules combine to form ClOOCl gas

2ClO --> ClOOCl

Step 3: ClOOCl absorbs sunlight and breaks into chlorine atoms and molecular oxygen

ClOOCl --> 2 Cl + O2

B) Overall Balanced equation

Cl2 + 4O3 -> 2 ClO + 5O2

Please help me thanks so much!?!?

Answers

The answer should be False.
In chemical reactions molecules do break and form bonds with other molecules in order for a new bond to create a new substance, which is a result of the chemical change.

Answer:

false

Explanation:

chemical changes turn into new substances

What best describes how the processes of scientific
investigation and technological design are involved in
this situation?
O The clothing company conducted a scientific
investigation to communicate results to researchers,
who then used the knowledge in a technological
design.
O The clothing company conducted a scientific
investigation to produce a product that researchers
could then test while designing new technology.
O The clothing company used technological design to
create a product that helped aid researchers
conducting a scientific investigation.
O The clothing company designed a new technology
that provided information researchers needed in order
to continue with their scientific investigation.

Answers

Answer:

O The clothing company conducted a scientific  investigation to communicate results to researchers,  who then used the knowledge in a technological

design.

Explanation:

The products of scientific investigation are converted into technology for use engineers.

Engineering is the application of science to solve life problems. Science in itself is an inquiry into nature.

Science uses a series of methodical approaches to conduct investigations and researches. The product of the research is taken up by an engineer. The engineer deploys this into the right and applicable technology available. In the clothing company, the product of the investigation are relayed to the engineers who uses technological innovations to design a new tool for use.

Submit your organization chart about the fictional elements. Remember to proofread your work before submitting.

Answers

Answer:

follow the picture,,, it includes the normal elements too

The reason why I organized these specific elements from the list of elements that you provided me is because they have to do with color. I believe organizing by color would be much easier for me to understand. There is also a somewhat equal amount  for each color. For example I used the colors: orange, green and red In my chart because there are four of each color in the list you provided me.

Calculate the enthalpy change with the help of Hess’s law for the decomposition of hydrogen peroxide, (2H O (l) ------- 2H O(l) + O (g)), if the enthalpy of formation of water (2H (g) +O (g)) is –512KJ and vaporization of hydrogen peroxide (H O (l) = H (g) + O (g)) is 376 kJ.

Answers

Answer:

Explanation:

For answer see attached file .

Molecule A undergoes isomerization to molecule B in acetone. Using curved arrows, showing key intermediates and any formal charges, propose a detailed mechanism for this isomerization. Provide a brief explanation why this isomerization occurs.

Answers

Answer:

hello your question is incomplete attached below is the complete question

answer :

we use Isomerization because conjugated allylic carbocation  is more stable when compared to a Non-conjugated Allylic carbocation

Explanation:

Reason for the mechanism

we use Isomerization because conjugated allylic carbocation  is more stable when compared to a Non-conjugated Allylic carbocation

attached below is the detailed mechanism

Why is glass NOT a crystal?
A its is a solid
B it is transparent
C it is not a crystalline
D it fractures

Answers

Answer:

I think it's B- it is transparent

Answer:A

Explanation:Glass can not be classified as a crystal when it is in its amorphous phase.

What is important to do after an experiment to make sure the results are valid and reliable? PLEASE ANSWER ASAP!!! IF YOU ANSWER CORRECTLY I WILL GIVE POINTS AND BRAINLIEST! THANK YOU :)

Answers

Scientist repeats an experiment with a different group of people or a different batch of the same chemicals and gets very similar results then those results are said to be reliable.

Which water usage uses the least amount of water in a year in the United States? a industry
b livestock c irrigation d public water supply


plzzzzzzzz hurrrrry​

Answers

A
Industry uses only about 18% while the others use around 70-90% of water.

A species of desert plant produces flowers that only bloom at night. How does this enhance the survival of the species?

A. This allows the plants to conserve water and not bloom during the heat of the day.

B. This species relies on nocturnal animals like moths for pollination and reproduction

C. This species relies on moonlight for photosynthesis.

D.This allows flowers to stay closed durng the day when herbivores are more likely to eat them.

Od

Answers

Answer:

A. This allows the plants to conserve water and not bloom during the heat of the day

Explanation:

Most desert plants only bloom at night because they take advantage of animals like moths and insects that fly at night for pollination and reproduction.

Because these plants are in the desert and do not get enough water except from short occasional rainfalls, they conserve water and not bloom during the heat of the day. They bloom at night when the temperature is low and this enhances their water conservation and survival.

Do atoms have the same number of protons as its neutrons? I know that atoms can have different number of electrons compared to protons, but does the number protons and neutrons stay equal?

Answers

Not necessarily. The atomic mass equals the number of protons+neutrons, but they don’t necessarily have to be the same. For example, for a carbon isotope of 14C, there would be 6 protons but 8 neutrons.

The density of a sample of gasoline is 0.70 g/cm3. What is the mass of 1 liter of this gasoline?
Group of answer choices

0.7 g

70 g

700 g

1,429 g

Answers

Answer:

700g

Explanation:

Given parameters:

Density of gasoline  = 0.7g/cm³

Volume of gasoline  = 1L  = 1000cm³  

Unknown:

Mass of the gasoline  = ?

Solution:

Density is the mass per unit volume of a substance. It can be expressed as;

 Density  = [tex]\frac{mass}{volume}[/tex]  

 So;

      Mass  = density x volume

    Mass  = 0.7 x 1000  = 700g

Which equation shows how to solve for enthalpy of solution based on the information in tables?​

Answers

Answer: B. triH sol Mgl2= -triHlat+ triHhydr Mg^2+ 2triHhydr^l-

Explanation:

Just did it and it was right

identify the reactants and products in the following chemical reaction C r 2 O 3 + 3 C ---> 2cr + 3CO

Answers

Answer:

Cr2O3 and 3C are the reactants

2Cr and 3CO are the products

Explanation:

Cr2O3is reacting with 3C to form 2Cr + 3CO

what is the formula for H-H

Answers

Answer:

H-H equation is written as follows:

pH=pK + log

{HCO3-}(base)

{H2CO3}(acid)

The empirical formula of a hydrocarbon (compound that contains only C and H is found to be CH. laboratory procedures have found that the molar mass of the compound is 78 g/mol. What is the molecular formula of this compound

Answers

Answer:

C₆H₆

Explanation:

Molar mass of the compound is 78g/mol

Unknown:

Molecular formula of the compound  = ?

Solution:

The empirical formula of the compound is CH.

Empirical formula is the simplest formula of a compound.

To solve this problem:

 Find the molar mass of CH;

       Molar mass = 12 + 1  = 13g/mol

Multiplication index  = [tex]\frac{78}{13}[/tex]    = 6

So;

              (CH)₆  ;

 Therefore:

               C₆H₆

how many atoms of Na are there in 0.17 moles of Na

Answers

Answer:

1.023 × 10²³ atoms

Explanation:

The number of atoms in a substance can be found by using the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.17 × 6.02 × 10²³

We have the final answer as

1.023 × 10²³ atoms

Hope this helps you

A quantity of water is heated from 25.0°C to 36.4°C by absorbing 325 J of heat energy. If the specific heat of water is 4.18 J / g°C, what mass is this quantity of water?

Answers

Answer:

6,8 g

Explanation:

c = 4.18 J/(g * °C) = 4180 J / (kg * °C)

[tex]t_{1}[/tex] = 25 °C

[tex]t_{2}[/tex] = 36,4 °C

Q = 325 J

The formula is: Q = c * m * ([tex]t_{2} - t_{1}[/tex])

m = [tex]\frac{Q}{c * (t_{2} - t_{1} )}[/tex]

Calculating:

m = 325 / 4180 * (36,4 - 25) ≈ 0,0068 kg = 6,8 g

The mass of the quantity of water heated from 25.0°C to 36.4°C by absorbing 325 J of heat energy is 6.8grams.

HOW TO CALCULATE MASS:

The mass of a substance can be calculated by using the following formula:

Q = m × c × ∆T

Where;

Q = quantity of heat absorbed (J)c = specific heat capacity (4.18 J/g°C)m = mass of substance∆T = change in temperature (°C)

According to this question;

m = ?

∆T = 36.4°C - 25°C = 11.4°C

Q = 325J

325 = m × 4.18 × 11.4

325 = 47.65m

m = 325 ÷ 47.65

m = 6.8g

Therefore, the mass of the quantity of water heated from 25.0°C to 36.4°C by absorbing 325 J of heat energy is 6.8grams.

Learn more about specific heat capacity at: https://brainly.com/question/2530523?referrer=searchResults

Why does hot tea brew faster than cold tea? Provide scientific data.

Answers

Answer:

Increased heat makes all the molecules in the tea/water mix vibrate and move around a great deal more, thus increasing the rate of diffusion, and therefore increasing the rate of brewing.

Explanation:

hope i help lol :)

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