100.mL of a .795 M solution of KBr is diluted to 500.mL. what is the new concentration of the solution?

Answers

Answer 1

Answer:

0.159 M

Explanation:

convert from mL to L then use the equation:

M1V1 = M2V2

rearrange to find M2

[tex]\frac{M1V1}{V2} = M2[/tex]

[tex]\frac{(0.795 M)(0.100 L)}{0.500 L} = 0.159 M[/tex]


Related Questions

What best describes the transition from gas to liquid

Answers

It's condensation in which gas particles have a higher kinetic energy..

THE POINT (-7,4) IS REFLECTED OVER THE LINE X=-3. THEN, THE RESULTING POINT IS REFLECTED OVER THE LINE Y=X. WHERE IS THE POINT LOCATED AFTER BOTH REFLECTIONS?

Answers

Answer: 4,2

The graph should show how to do it.

0.500 mol aluminium hydroxide, Al(OH)3 reacts with 0.500 mol sulphuric acid, H2SO4 to produce aluminium sulphate and water.

a) Write the balanced equation for the reaction.

b) Which reactant is limiting reactant?

c) How many moles of excess reactant is used in the experiment?

d)Determine how many moles of aluminium sulphates was obtained if the percentage yield of aluminium sulphate during the experiment is 77%. [9 marks]​

Answers

The number of moles of excess reactant is used in the experiment is 0.33 moles. The number of moles of aluminium sulphates was obtained  0.129 moles if the percentage yield is 77%.

2Al(OH)3(aq) + 3H2SO4(aq) -----> Al2(SO4)3(aq) + 6H2O(l)

Number of moles of Al(OH)3 = 0.500 mol

Number of moles of H2SO4 = 0.500 mol

We have to determine the limiting reactant as follows;

2 moles of Al(OH)3 reacts with 3 moles of H2SO4

0.500 moles of  Al(OH)3 reacts with 0.500 moles ×  3 moles/2 moles

= 0.75 moles of H2SO4.

This means that H2SO4 is limiting reactant

Since  3 moles of H2SO4 reacts with 2 moles of Al(OH)3

0.500 moles of  H2SO4 reacts with  0.500 × 2 moles /3 moles

= 0.33 moles

Only  0.33 moles of excess reactant was used in the experiment.

3 moles of  H2SO4 yields 1 mole of  Al2(SO4)3

0.500 moles of  H2SO4 yields  0.500 moles ×  1 mole/3 moles = 0.167 moles

Theoretical yield of Al2(SO4)3 = 0.167 moles

% yield = actual yield/Theoretical yield × 100/1

Actual yield = % yield × Theoretical yield /100

Actual yield =  77 ×  0.167/100

Actual yield = 0.129 moles

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What is the osmotic pressure of a solution made by dissolving 35.0 g of glucose, C6H12O6, in enough water to form 800.0 mL of solution at 11.0 ∘C ?

Answers

Answer:

Osmotic pressure, a colligative property can be determined from

π = iMRT

π = osmotic pressure in atm

i = van't Hoff factor = 1 for glucose, a non electrolyte

M = molarity = 30.0 g x 1 mol/180 g x 1/0.650 L = 0.2564 M

R = gas constant = 0.0821 Latm/Kmol

T = temperature Kelvin = 14.0º + 273 = 287K

Explanation:

how many chemical bonds are formed in CH4 molecule​

Answers

Answer:

4 covalent bonds

I need help wit this

Answers

#1

[tex]\\ \sf\longmapsto2 Ca+O_2\longrightarrow 2CaO[/tex]

Balanced

#2

[tex]\\ \sf\longmapsto N_2+3H_2\longrightarrow 2NH_3[/tex]

Balanced

#3

[tex]\\ \sf\longmapsto 2Cu_2O+C\longrightarrow 4Cu+CO_2[/tex]

Balanced

#4

[tex]\\ \sf\longmapsto H_2O_2\longrightarrow H_2O+O_2[/tex]

Already balanced

The temperature of an object increases by 26.1 °C when it absorbs 3711 J of heat. Calculate the heat capacity of the object.

C = ________________ J/°C

Answers

Answer:

[tex]\displaystyle C = 142\text{ } \frac{J}{^\circ C}[/tex]

Explanation:

We can utilize the heat capacity formula:

[tex]\displaystyle q = C\Delta T[/tex]

Where q is the heat energy, C is its heat capacity, and ΔT is the change in temperature.

By substitution, q = 3711 J and ΔT = 26.1 °C. Hence:

[tex]\displaystyle \begin{aligned} (3711 \text{ J}) & = C(26.1\text{ } ^\circ\text{C}) \\ \\ C & = 142\text{ } \frac{J}{^\circ C}\end{aligned}[/tex]

Hence, the heat capacity of the substance is about 142 J per degrees Celsius.

how many atoms of carbon atoms are in the reactant

Answers

Answer:

8

Explanation:

There are 8 carbon atoms in the reactants' side, because you multiply the 2 in front of C4H10 and the 4 under the C atom, and that gives you 8. So, 8 carbon atoms.


Which procedure would produce the best data for comparing the electrostatic forces between the molecules of different
substances? (1 point)
O Heat each substance in solid form for the same amount of time. Measure the temperature of each substand
O Heat each substance in liquid form to its boiling point. Measure the temperature of each substance
O Heat each substance in liquid form for the same amount of time. Measure the temperature of each substand
Heat each substance in solid form to its melting point. Measure the quantity of each substance that has
melted

Answers

The Whole Electrical Bonding Investigation Plan Quick check

1) B. boiling point, surface tension, vapor pressure

2) A. glycerin

3) C. the temperature at which additional heat energy causes the substance to change from a liquid to a gas

4) D. Heat each substance in liquid form to its boiling point. Measure the temperature of each substance

5) A. A liquid boils when the vapor pressure equals the atmospheric pressure.

Statement that explains the procedure would give the best data when making comparism of electrostatic forces that exist between the molecules of different substance is C: Heat each substance in liquid form for the same amount of time. Measure the temperature of each substand.

Electrostatic force can be regarded as attractive or repulsive forces that exist between particles, and this as a result of their electric charges.

When making comparisons about electrostatic forces that exist between the molecules of different substance.

Then the substance has to be heated in their liquid form with sane time period , then followed by measurements of the temperature of each stand.

Therefore, option C is correct.

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The organelle is found in plant cells contains a green pigment and is the site of photosynthesis. this organelle is the _______

Answers

Answer: Chloroplasts
Reasoning: I just had my 830th lesson in school about these

Answer: Chloroplast

Explanation:

Each element can be indentified by the number of _______ found in its nucleus, which also equals the elements _______ _______.

Answers

Answer:

Protons, Atomic number

protons, atomic number

When the volume of a closed container containing hydrogen gas is increased by a factor of two, how will this affect the number of hydrogen atoms in the container

Answers

We have that for the Question "When the volume of a closed container containing hydrogen gas is increased by a factor of two, how will this affect the number of hydrogen atoms in the container"

Answer:

Number of hydrogen atoms depend only on amount of gas which remains constant. Hence, increasing the volume of container has no affect on number of hydrogen atoms.

Explanation:

The number of hydrogen atoms will remain the same in the container. Because the container is closed and amount of hydrogen gas remains constant, which means that no extra amount of hydrogen gas is removed or added from the container when volume increases.

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If 20.3 g of NO and 13.8 g of O₂ are used to form NO₂, how many moles of excess reactant will be left over?
2 NO (g) + O₂ (g) → 2 NO₂ (g)

Answers

Answer:

0.02 moles of O₂ will be leftover.

Explanation:

Anwser is wasssssssup

calculate the Mass of lead that will be deposited from an aqueous solution of lead(2)salt by the same quantity of electricity that deposit 2.7g of copper from an aqueous solution of copper (2)salt​

Answers

Answer:

8.82 gm of Pb

Explanation:

Question

calculate the Mass of lead that will be deposited from an aqueous solution of lead(2)salt by the same quantity of electricity that deposit 2.7 g of copper from an aqueous solution of copper (2)salt​Since the oxidation# of the Pb and the Cu is the same, we know that the same amount of electricity that will deposit 1 mole of Cu will deposit 1 mole of Pb

2.7 gm of Cu were deposited

the atomic mass of Cu = 63.5

the  number of moles of Cu deposited was 2.7/63.5 = 0.0425 moles

so 0.0425 moles of Pb will be deposited.

The atomic mas of Pb is 207.2

0.0425 mole of Pb weigh 0.0425 X 207.2 =

8.82 gm of Pb

What is the weight of:
i) 1 mole of oxygen atoms?
ii)
i) 3 moles of iron atoms?
3 ?
iii) 20 moles of calcium carbonate?

Answers

Answer:

Oxygen = 15.999 g/mol

Iron = 3 × 55.845 = 167.535 g/mol

CaCO3 = 20 × 100.0869 = 2001.738 g/mol

What is the difference between speed and velocity?​

Answers

Answer:

Speed is how far something goes in a unit of time.

Velocity is the same as speed but with direction.

Explanation:

How much is 1 mole of something?
O A. 6.02 x 10
O B. 6.02 x 10-23
O C. 6.02 × 23
O D. 6.02 x 1023

Answers

Answer:

see explanation

Explanation:

How much is 1 mole of something?

O A. 6.02 x 10

O B. 6.02 x 10-23

O C. 6.02 × 23

O D. 6.02 x 1023

look carefully at your picture

use a magnifying glass if you need to

I am rewriting the choices the way it appears i  your picture

A. 6.02  X 10

B 6.02 X 10^-23

C. 6.02^23

D. 6.02 X 10^23

the answer is D. you left out "to the pow......"  

a significant mistake

what is in your picture is 6.02 X 10^23 and means

6.02 X 100,000,000,000,000,000,000,000

what you wrote 6.02 X 1023 means 6158

when we are talking about the number of teensy tiny atoms in a measurable mass we are talking BIGGGGG  GIANTTTTT numberswhen written correctly, the answer is D

0.500 mol aluminium hydroxide, Al(OH)3 reacts with 0.500 mol sulphuric acid, H2SO4 to produce aluminium sulphate and water.
a) Write the balanced equation for the reaction.

b) Which reactant is limiting reactant?

c) How many moles of excess reactant is used in the experiment?

d)Determine how many moles of aluminium sulphates was obtained if the percentage yield of aluminium sulphate during the experiment is 77%.

[9 marks]​

Answers

a) The balanced equation for the reaction would be as follows:

[tex]2 Al(OH)_3 + 3 H_2SO_4 ---> Al_2(SO_4)_3 + 6 H_2O[/tex]

b) The mole ratio of aluminum hydroxide to sulfuric acid is 2:3. This means that every 1 mole of the aluminum hydroxide would require 1.5 moles of sulfuric acid.

0.5 mole aluminum hydroxide would require:

         0.5 x 3/2 = 0.75 moles of sulfuric acid.

But only 0.500 moles of sulfuric acid is present. Thus, the limiting reagent is sulfuric acid.

c) With 0.5 moles sulfuric acid, the mole of aluminum hydroxide required would be:

             0.5 x 2/3 = 0.33

Excess moles of aluminum hydroxide = 0.5 - 0.33

                                                              = 0.17 moles

d) The mole ratio of sulfuric acid to aluminum sulfate produced is 3:1. With 0.5 moles sulfuric acid, the mole of aluminum sulfate produced would be:

        0.5 x 1/3 = 0.17 moles

But the percentage yield is 77%

   77/100 x 0.17 = 0.13 moles

Thus, the moles of aluminum sulfate that would be obtained with a percentage yield of 77% would be 0.13 moles.

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Which is not an example of vaporization?

Answers

Answer:

boi i need the choices idiot

Explanation:

Nobody can add an answer without context.

But if this helps,

"Vaporization of an element or compound is a phase transition from the liquid phase to vapour. There are two types of vaporization: evaporation and boiling. Evaporation is a surface phenomenon, whereas boiling is a bulk phenomenon." - Wikipedia

https://en.wikipedia.org/wiki/Vaporization


Learning task 1: as you start exploring the subject answer the following question write your answer on your answer sheet

need help pls ​

Answers

In this exercise, it is necessary to know the systems that our bodies have and complete the sheet that will correspond to these answers:

1- Digestive

2- Urinary

3- Respiratory

4- Skeletal

5- Muscular

6-  Integumentary

7-  Cardiovascular

8-  Endocrine

9- Nervous

10- Reproductive

So looking in more detail, the number one corresponds to the digestive system because it is the digestive process that starts in the mouth. The second is related to the urinary system, which is responsible for the filtration and elimination of excess water. The respiratory system corresponds to the third option, which is the gas exchange that occurs in the pulmonary alveoli.

The numbers 4, 5, and 6 are very important systems for the support of the human body, being respectively the skeleton system, the muscular system, and the integumentary system. The first system is responsible for support while the second is better known for locomotion and finally the third is known for covering the human body by the dermis.

The cardiovascular system is responsible for getting the blood transported throughout the body and pumped by the heart, so this system is related to number 7. Then the endocrine system is responsible for the hormones and how these hormones acted in the body and are number 8.

The number 9 corresponds to one of the most complex and principal systems, the nervous system, which has neurons as its cells and transmits the nervous impulse in response.

The last treated system is the reproductive system, known for its reproductive gametes, and its most important role is to maintain the reproduction of the species.

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Giving brainly for correct answer! :)

Answers

Answer:  I think its in order, not really sure. First answer on top. Next answer on the left and the Last answer on the right.

How is melting simillar evaporation

Answers

Answer:

Melting and evaporation both represent changes in matter that involve behavior at the molecular level.

Answer:

well both disappear over time

Explanation:

The specific heat of a certain type of cooking oil is 1.75J(g. °C). How much heat energy is needed to raise the temperature of 2.44 kg of this oil from 23. °C to 191 °C?

Answers

Answer:

The amount of heat needed is 593.88 kJ.

To determine the heat of neutralisation, Chelsea placed 50 cm' of sodium hydroxide
solution of concentration 1.0 mol dm- in a polystyrene cup and recorded its
temperature. She then recorded the temperature of 50 cm of sulfuric acid, added it
to the cup, stirred the solution and recorded its maximum temperature, as follows:
. initial temperature of NaOH(aq) = 29.5 °C
. initial temperature of H.SO, (aq) = 29.9 °C
• maximum temperature of the solution = 35.8 °C

Calculate the increase in temperature

Answers

2 solutions of NaOH and H₂SO₄ at 29.5 °C are mixed in a coffee-cup calorimeter and after the reaction is completed the temperature is 35.8 °C. The increase in the temperature is 6.3 °C.

To determine the heat of neutralization, Chelsea used a coffee-cup calorimeter.

Initially, she had 2 solutions, NaOH and H₂SO₄, both at 29.5 °C. Upon mixing, the heat was evolved and the final temperature of the solution was 35.8 °C. The neutralization reaction was:

NaOH + H₂SO₄ ⇒ Na₂SO₄ + H₂O

The increase in temperature (ΔT) is equal to the difference between the final temperature and the initial temperature.

[tex]\Delta T = 35.8 \° C - 29.5 \° C = 6.3 \° C[/tex]

This data can be used to calculate the heat of neutralization (q) using the following expression.

[tex]q = c \times m \times \Delta T[/tex]

where,

c is the specific heat capacity of the solutionm is the mass of the solution

2 solutions of NaOH and H₂SO₄ at 29.5 °C are mixed in a coffee-cup calorimeter and after the reaction is completed the temperature is 35.8 °C. The increase in the temperature is 6.3 °C.

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Um Is it in third period and has three electrons in its highest P orbitals

Answers

Answer:

Shut yo musty dusty ah up zaddy

Explanation:

come here big mami

A student would like to determine how heating a liquid changes its volume. The student hypothesizes that the liquid will increase in volume. The following list shows the steps taken by the student in order to test the hypothesis.
1.Select the liquid to test.
2.Place the liquid in a sealed container.
3.Use a Bunsen burner to heat the liquid by 10°C.
4.Measure the volume of the liquid.
5.Record the results.
What is wrong with how the student conducted the investigation?
A.
The hypothesis was not valid because it is impossible for liquids to change in volume.
B.
The volume of the liquid should be measured before it is heated.
C.
The student should have increased the temperature of the liquid by more than 10ºC.
D.
The length of time it took for the liquid to be heated should be measured.

Answers

Answer:

The volume of the liquid should be measured before it is heated.  

Explanation:

Because During an experiment to test how a variable changes a substance, it is important to first observe and record the characteristics of the substance before the variable is introduced. In this case, the variable is heat energy.  

The forecast predicted the atmospheric pressure to be 1.03
atm today. What is this pressure in mmHg? (Round to the
nearest ones)
mmHg

Answers

The pressure in mmHg forecasted today is 783 mmHg

Pressure is the force acting perpendicular to the area of a surface. Pressure is given by:

Pressure = Force/Area

The pressure of a gas is the force exerted on the walls of its container by the gas. Pressure can be measured in atm, mmHg, etc.

1 atm = 760 mmHg

1.03 atm = 760 mmHg per atm * 1.03 atm = 783 mmHg

Therefore the pressure in mmHg forecasted today is 783 mmHg

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PLEASE HELP ASAPPPPPP

Answers

Answer:

accelerating upward would be your answer

Which candle burned the longest time why

Answers

Answer:

The one that burned longer because it burned longer

Explanation:

Poured beeswax candles will burn the longest
Why: slowest due to the hardness of the wax and the high temperature needed to melt the wax

The number of carbon atoms in 45.21g C

Answers

Answer:

2.26 X10^24 carbon atoms

Explanation:

The number of carbon atoms in 45.21g C

carbon has an atomic mas of 12.01 gm

45.21 g  has 45.21/12.01 = 3.76 moles of C

a mole contains  Avogadros number of particles

6.022 X 10^23

3.76 moles contain 3.76 X6,022 X 10^23 =

2.26 X10^24 carbon atoms

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