CHEMISTRY HIGH SCHOOL

What volume of a 2.5 M stock solution of acetic acid (HC2H3O2) is required to prepare 100.0 milliliters of a 0.50 M acetic acid solution?

Answers

Answer 1
Answer: Mi * Vi = Mf * Vf

2.5 * Vi = 0.50 * 100.0

2.5 Vi = 50

Vi = 50 / 2.5

Vi = 20 mL

hope this helps!
Answer 2
Answer:

Answer:

20 milliliters

Explanation:

I don't cap

Related Questions

#1: Which of the following is an exothermic reaction? A. dissolving ammonium nitrate in water to cool the water B. condensation C. melting ice D. dissolving sugar in water. #2: Two objects (A and B) of the same temperature are in contact with each other. Which of the following statements is true? A. Heat transfers from object B to object A, because molecules from B collide with those from A. B. Heat transfers from object A to object B, because molecules from A collide with those from B. C. Although the molecules collide, no heat transfers because there is no temperature difference between the objects. D. No heat transfers, because there are no collisions between the molecules of the objects. #3: Which of the following parameters is kept constant in a coffee-cup calorimeter? A. temperature B. volume C. pressure D. kinetic energy #4: What type of substance would be best for use in a heating system? A. a liquid with a high specific heat B. a solid with a high specific heat C. a liquid with a low specific heat D. a gas with a low specific heat. #5: The reaction 2 NO(g) → N2(g) + O2(g) has a ΔH = -180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction? A. 644 kJ B. 180.5 kJ C. 301 kJ D. 322.3 kJ
What effect does the presence of dissolved sodium fluoride have on the dissociation equilibrium of hydrofluoric acid? (select all three that apply)...The percent dissociation of HF is reduced by the presence of dissolved NaF. THe pH of the solution containing NaF and HF would be higher than that of a solution of HF only. The presence of NaF drives the reaction towards the HF side to reach equilibrium. The concentration of H+ is higher in an HF solution containing NaF. The pH of the solution containing NaF and HF would be lower than that of a solution of HF only. The presence of the dissolved NaF does not affect the HF equilibrium reaction nor the equilibrium concentrations.
Heat, like work, is an energy transfer measured in
Which statement best describes the effect of low ionization energies and low electronegativities on metallic bonding? a. The valence electrons are easily delocalized. b. The valence electrons stay in a single orbital. c. The valence electrons break free of the crystals. d. The valence electrons move closer to the nuclei.
The superheated water vapor is at 15 MPa and 350°C. The gas constant, the critical pressure, and the critical temperature of water are R = 0.4615 kPa·m3/kg·K, Tcr = 647.1 K, and Pcr = 22.06 MPa. Determine the specific volume of superheated water based on the ideal-gas equation. (You must provide an answer before moving to the next part)

The atoms of a certain material can absorb red and blue light frequencies. What happens to yellow light that shines on it? It is absorbed.
It is reflected.
It is transmitted.
It is either reflected or transmitted.

Answers

Answer: It is either reflected or transmitted.

Explanation:

The color of the objects is due to the light reflected to our eyes.The light falls on the surface of the object and the color which does not get absorbed by the object gets transmitted or reflected and thus appear to be of the same color as the reflected or transmitted light.

Example:  If an object absorbs all of the frequencies of visible light except for the frequency associated with green light, then the object will appear green in color.
It is reflected ir transmitted depending on what the material is. The color that something appears is actually the color that it reflects or transmits and not the color that it absorbs. I hope this helps.

According to the big bang theory, approximately when did the universe begin?4 billion years ago
7 billion years ago
11 billion years ago
13 billion years ago

Answers

The correct answer is 13 billion years ago.  

The Big Bang theory is the existing cosmological model for the apparent universe from the most primitive known periods via its consequent large scale evolution. The model illustrates that how the expansion of the universe took place from a very high temperature and high-density state and provides a complete illustration for a wide array of processes comprising the existence of cosmic microwave background, light elements, Hubble's law, and large scale structure.  

The complete measurements of the rate of expansion of the universe put the Big Bang at approximately 13.8 billion years ago, that is, thus regarded as the age of the universe.  
According to the big bang theory it would be around 13 billion years ago.

The molar heat of vaporization of water is 40.7kJ/mol. How much heat must be absorbed to convert 50.0 grams of liquid water at 100oC to steam at 100oC?A) 1.46 X 10 kJ
B) 1.13 X 102kJ
C) 2.04 X 103kJ
D) 3.66 X 104kJ

Answers

During a phase change the temperature does not change since all of the heat is being absorbed in order to break the intermolecular forces.  Due to that, the formula will not need to have T in it and is actually q=nΔH(v).
n=the number of moles (in this case 2.778mol of water since you divide 50g by 18g/mol).
ΔH(v)=the molar heat of vaporization (in this case 40.7kJ/mol).
q=the heat that must be absorbed
q=2.778mol×40.7kJ/mol
q=113.1kJ
Therefore the water needs to absorb 1.13×10²kJ.

I hope this helps.  Let me know if anything is unclear.

The temperature of a sample of water changes from 10°C to 20°C when the water absorbs 100 calories of heat. What is the mass of the sample?

Answers

Answer:

10 g

Explanation:

Right from the start, just by inspecting the values given, you can say that the answer will be  

10 g

.

Now, here's what that is the case.

As you know, a substance's specific heat tells you how much heat is needed to increase the temperature of  

1 g

of that substance by  

1

∘

C

.

Water has a specific heat of approximately  

4.18

J

g

∘

C

. This tells you that in order to increase the temperature of  

1 g

of water by  

1

∘

C

, you need to provide  

4.18 J

of heat.

Now, how much heat would be required to increase the temperature of  

1 g

of water by  

10

∘

C

?

Well, you'd need  

4.18 J

to increase it by  

1

∘

C

, another  

4.18 J

to increase it by another  

1

∘

C

, and so on. This means that you'd need

4.18 J

×

10

=

41.8 J

to increase the temperature of  

1 g

of water by  

10

∘

C

.

Now look at the value given to you. If you need  

41.8 J

to increase the temperature of  

1 g

of water by  

10

∘

C

, what mass of water would require  

10

times as much heat to increase its temperature by  

10

∘

C

?

1 g

×

10

=

10 g

And that's your answer.

Mathematically, you can calculate this by using the equation

q

=

m

⋅

c

⋅

Δ

T

 

, where

q

- heat absorbed/lost

m

- the mass of the sample

c

- the specific heat of the substance

Δ

T

- the change in temperature, defined as final temperature minus initial temperature

Plug in your values to get

418

J

=

m

⋅

4.18

J

g

∘

C

⋅

(

20

−

10

)

∘

C

m

=

418

4.18

⋅

10

=

10 g

Given the balanced equation representing a reaction: 2na(s) + cl2(g) → 2nacl(s) + energy if 46 grams of na and 71 grams of cl2 react completely, what is the total mass of nacl produced? 1. 58.5 g 2. 117 g 3. 163 g 4. 234 g

Answers

Answer is: 2) 117g.
2Na + Cl₂ → 2NaCl
Step 1: calculate amount of substance of sodium and chlorine.
n(Na) = m(Na)÷M(Na) = 46g ÷ 23 g/mol = 2 mol.
n(Cl₂) = m(Cl₂)÷M(Cl₂) = 71g ÷ 71 g/mol = 1 mol.
Step 2: calculate amount of substance and mass of sodium-chloride.
Because both sodium and chlorine react completely, we can use both n to compare with n of NaCl.
n(Na) : n(NaCl) = 2:2, 2 mol : n(NaCl) = 2:2
n(NaCl) = 2mol, m(NaCl) = 2mol ·5805 g/mol = 117 g.

Which electrons are removed first when forming cations of Period 4 transition elements?

Answers

Electrons are always removed from the valence electron shells and from the valence orbitals within the shell when forming a cation. For example, Cr has a electronic configuration of 1s2 2s2 2p6 3s2 3p6 3d5 4s1
When forming the ion Cr3+, the new electronic configuration will be 1s2 2s2 2p6 3s2 3p6 3d3. We can see that 3 electrons are removed from the valence shell following the order of the highest energy orbitals to lower energy.
Other Questions
One way to remove nitrogen oxide from smokestack emissions is to react it with ammonia: 4 NH3 (g) + 6 NO (g) ----------> 5 N2 (g) + 6H2O (I)Fill in the blanks below:12.3 mol of NO reacts with ______ mol of ammonia5.87 mol of NO yields _______ mol nitrogen
A piece of iron (Cp = 0.450 J/(gi°C)) that has a mass of 21.5 g and an initial temperature of 100.0°C is submerged in X g of water (Cp = 4.184 J/(gi°C)) at 20.0°C. The temperature of the system (iron and water) changes to 21.4°C. What is the value of X? A. 041 g. B. 80 g. C. 132 g. D. 574 g
On a hot summer day Lam walked home from his grandmothers with a chocolate bar in his pocket. When he arrived home the chocolate bar had melted in his pocket, which statement BEST explains why thechocolate bar melted?A Heat transferred from the chocolate bar to his pocket.B. Heat evaporated from his pocket to his chocolate bar.c. Heat condensed from his leg to his chocolate bar in his pocket.D. Heat transferred from the environment to the chocolate bar in his pocket.
Increasing temperature increases the number of collisions and the potential energy of the colliding molecules anddecreases the reaction rate.True or False PLZ HELP!!