How many Joules of heat are required to melt 250 grams of ice at 0°C?
AHfus = 334 J/g
AHvap = 2258 J/g
Cp= 4.184 J/g C

Answers

Answer 1

Answer:

cp =4.184/c / j

Explanation:

ahvap=2258j/g

Answer 2

Heat required : Q = 83500 J = 83.5 kJ

Further explanation

Given

mass ice = 250 g at 0°C

Required

The heat required

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)

Lf=latent heat of fusion

Input the value :

Q = 250 g x 334 J/g

Q = 83500 J


Related Questions

What does the difference in force depend on?

Answers

This law is further given to mean that the acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the

eseasdasdsadasdadasda
r

Answers

bdhejweisif djseuhehsbs sshsdjdjdle

Element X has three electrons in its outermost orbit.
Element Y has seven electrons in its outermost orbit.

What is the chemical formula of the ionic compound
formed by these elements when they react together?
(Use X and Y as the chemical symbols.)

PLEASE SOMEONE EXPLAIN THIS IN DETAIL

Answers

Explanation:

element x _ carbon having two shells 2,3

element y _ fluorine atomic no 9 EC 2,7

when carbon react with fluorine it destroyes graphite and form fluorocarbons and thus form covalent bond

hope it helps u

There have been made 2 attempts of oxygen production by potassium permanganate.In the first attempt they have got 75ml oxygen in 3 minutes whearas there have been got 100ml in 5 minutes by the 2nd attempt.In what case the speed of the oxygen production is bigger???
Pls explain your answer

Answers

Answer:

The speed of oxygen production is bigger in the first attempt.

Explanation:

In the first attempt, since 75ml oxygen is produced in 3 minutes, the rate of oxygen production is r = volume of oxygen/time = 75 ml/3 min = 25 ml//min

In the second attempt, since 100ml oxygen is produced in 5 minutes, the rate of oxygen production is r' = volume of oxygen/time = 100 ml/5 min = 20 ml//min

Since r = 25 ml/min > r' = 20 ml/min, the speed of oxygen production is bigger in the first attempt.

What accounts for the fact that liquid mercury forms into tight beads while ethyl alcohol do not?

Answers

Answer:

Pretty sure this is wrong but worth a shot

Explanation:

Ethyl Alcohol is a clear, colorless liquid with a wine-like odor. It is used in alcoholic . Do not rely on odor alone to determine ... This chemical is on the Special Health Hazard Substance. Ethyl Alcohol can affect you when inhaled and by passing through the Ethyl Alcohol may form an ignitable vapor/air mixture in.

7. True or false. Where air masses collide, weather changes

Answers

Answer:true

Explanation:

what is the barycenter of the moon and the earth​

Answers

Answer:

The barycenter is the point in space around which two objects orbit. For the Moon and Earth, that point is about 1000 miles (1700 km) beneath your feet, or about three-quarters of the way from the Earth's center to its surface.

Explanation:

What is a similarity between the respiratory and excretory systems?

A They both break down food.
B They both remove waste from the body.
C They both exchange gases within the body.
D They both transport nutrients throughout the body.

Answers

Answer:

B

Explanation:

The respiratory removes carbon, and the excretory removes other waste products

Both collect waste from body cells and removes them. The respiratory system moves gases (oxygen and carbon dioxide) and the excretory system moves liquids and solids.

if you add 5 protons, 4 neutrons, and 3 electrons what is the net charge of the atom

Answers

The answer would be 2 protons because protons are positive and electrons are negative so 5-3=2 and neutrons are neutral they don’t do anything to the charge of the atom

Does the temperature of the solvent (water) affect the rate of dissolving?​

Answers

Yes. Heating up the solvent gives the molecules more kinetic energy. The more rapid motion means that the solvent molecules collide with the solute with greater frequency and the collisions occur with more force. Both factors increase the rate at which the solute dissolves.

Cuantos gramos de nitrato de potasio (KNO3) son necesarias para preparar 800ml de solucion al 12 % m/v

Answers

Answer:

96 g

Explanation:

Tomando en cuenta que estamos hablando de una solución de Nitrato de potasio cuya concentración es 12% m/V, debemos entonces usar la expresión de %m/V:

%m/V = msto / Vsol * 100   (1)

De esta expresión, debemos despejar la masa de soluto (msto) que es precisamente el valor que estamos buscando. Al hacer el despeje tenemos:

msto = %m/V * Vsol / 100    (2)

Ahora solo nos queda sustituir los valores dados y resolver:

msto = 12 * 800 / 100

msto = 96 g de KNO₃

Espero te sirva.

PLEASE HELP ME ILL GIVE BRAINLIEST

Answers

Answer:

TRUE :)

Explanation:

blood is pumped through the pulmonary artery to the lungs, where it picks up oxygen and releases carbon dioxide.

Answer:

False

Explanation:

it takes it to tha lungs.

The half-life of cobalt-69 is 6 years. How much of a 5-gram sample is left after 12 years

Answers

Answer:

that was wrong my bad. just delete my answer

Explanation:

18. How is the kinetic energy of molecules changing when the molecules move faster?
The kinetic energy ...
a
is not changing
b
depends on the molecules.
С
is decreasing.'
d
is increasing
Scroll for more

Answers

Answer:

d

Explanation:

the more movement the more energy

Does anyone know this?

Answers

Answer:

Not balanced. There are different number of atoms on each side of equation.

Explanation:

Given balanced chemical equation:

Chemical equation:

3C₂H₄ + 3O₂    →       4CO₂ + 6H₂O

The equation is not balanced because  umber of moles of C, H and O are not balanced. It consist of six moles of C, 12 moles of H and six moles of oxygen on left side of equation while on right side there are 4 moles of C fourteen moles of oxygen and twelve moles of hydrogen present.

Balanced chemical equation:

C₂H₄ + 3O₂    →       2CO₂ + 2H₂O

Now the equation became balanced. There are two moles of carbon, four moles of hydrogen and six moles of oxygen are present on both side of equation.

How many moles of solute are in 250 mL of 2.0 M CaCl2? How many grams of CaCl2 is
this?

Answers

Answer:The solution contains 0.50 mol or 55 g of CaCl2 . You know there are 2.0 mol of CaCl2 in 1 L of solution. (40.08 + 2 × 35.45) g=(40.08 + 70.90)

g=110.98 g

Explanation:

My I please have brainliest

110.98 grams of CaCl₂ is there present in 2.0 M CaC₂.

What is calcium chloride?

Calcium chloride is made up of calcium and chloride.

Given, that the solution contain 250 mL of 2.0 M CaCl2

You know there are 2.0 mol of CaCl2 in 1 L of solution.

(40.08 + 2 × 35.45) g

= (40.08 + 70.90)

=110.98 g

Thus, 110.98 grams of CaCl₂ is there present in 2.0 M CaC₂.

Learn more about calcium chloride

https://brainly.com/question/15296925

#SPJ2

A bathtub is half full of warm water. How could the
thermal energy of the water be increased? Check
all that apply.

Answers

Answer: A. B and C

Explanation:

I'm pretty sure this is right....

Have a great day :)

Answer: It is A,B. and C.= Add hot water to the tub.

Heat the water in the tub without adding more water.

Add more water at the same temperature to the tub.

Explanation: I got it correct.

How many molecules are in 10 moles of H2

Answers

You’re going to multiply the number of moles with Avogadro’s number, 6.02*10^23.
10(6.02*10^23)= 6.02*10^24

The number of molecules in one mole of hydrogen gas is 6.02 × 10²³ . The number of molecules in 10 moles of hydrogen gas is then 6.022 ×10²⁴.

What is one mole?

Any substance  that contains   6.022 × 10²³ number of atoms is called ne mole of that substance. This number is called Avogadro number. Hence, one mole of every elements contains Avogadro number of atoms.

Hydrogen  is the first element in periodic table. It is an alkali metal. The number of molecules  in one mole of H₂ is equal to Avogadro number. Mass of a molecule with one mole of amount is called its molecular mass.

Number of molecules of H₂ in one mole  =  6.02 × 10²³  

Then number of molecules in 10 moles is Avogadro  number times the number of moles.

= 10 × 6.022 × 10²³ =  6.022 ×10²⁴ molecules

Therefore, 10 moles of  H₂ contains  6.022 ×10²⁴molecules..

Find more on Avogadro number:

http://brainly.com/question/11907018

#SPJ2

what is Radio Waves and its defonation

Answers

Answer:

radio waves are the sound waves that are produces by a radio

Explanation:

If Jorge wanted to measure the distance between the Sun and the closest star to it, which unit should he use? no guessing

kilometer


meter


astronomical unit


light year

Answers

Answer:

i think kilometer or light year

Explanation:

A student uses eight chocolate sandwich cookies to model the Moon's phases. The student separates each cookie and removes frosting to show how the Moon looks at each phase. How would the student create the Waning Gibbous phase?

Answers

The link below is a picture of the "Waning gibbus" phase,  really hope that it helps you out :D

Please help (: List and describe the locations and conditions in the Four zones of a lake

Answers

Explanation:

littoral horizantal raw curated


acid+base->salt+water
What type of reaction is this?​

Answers

Answer:

The reaction of an acid with a base is called a neutralization reaction. The products of this reaction are a salt and water.

Answer:

Neutralization reaction

Explanation:

Neutralization reaction it the reaction of acids and bases that form salt and water

hope it's helpful ❤❤❤❤

THANK YOU.

What is the smallest unit found in a bar of gold. A. atom. B. Cell. C. Element. .D Nucleus PLEASE HELP

Answers

Answer:

c. element

Explanation:

Because gold is its own element, a gold bar is only made of one element.

The smallest unit found in a bar of gold is the nucleus of its atom.  The core of an atom is called its nucleus which contains the nucleons protons and neutrons.

What is nucleus?

An atom is composed of  nucleons and electrons. The core of an atom is called its nucleus. Protons and neutrons are located inside the nucleus. They are called the nucleons.

The electrons are revolving around the nucleus through circular trajectories of fixed energies. Every elements are composed of their atoms. Atoms of different elements combine together to form compounds.

Gold is 79th element in periodic table. It is a transition metal in d-block. As every other elements the smallest unit are atoms where the atomic nuclei are even smaller units.

Find more on atomic nucleus:

https://brainly.com/question/13071433

#SPJ6

which part of the plant you think is the least important?

Answers

Answer:

Well maybe the pedals they don't help much

Explanation:

Answer:

brainliest please

Explanation:

the pollen probably because other plants have it

Which describes an example of ecological succession?​

Answers

Answer:

b. a meadow replacing a pond in it's flood plain

Explanation:

I'ts a secondary succession.

Does the following compound contain a polyatomic ion? NH4NO3

Answers

Answer:

Yes

Explanation:

bro needs help

32.5 grams of NaOH reacts with an excess of CO2

2NaOH(s) + CO2(g) ⇒ Na2CO3(s) + H20

What is the theoretical yield of Na2CO3 in grams?

*** I NEED YOU TO SHOW YOUR WORK BROS, I ALREADY HAVE THE ANSWER (43.1g) ***

Answers

i tried and got 6.89g of Na2CO3

Mechanical energy is the total amount of and energy in a system. science

Answers

Answer:

Hey do you know if "horsleyjaydyn" is a girl you commented once she was a guy so

Explanation:

Which of the following best describes what happens when hydrogen and oxygen to form water?
Atoms are changing place with other atoms
Hydrogen and oxygen are undergoing change of states.
Hydrogen and oxygen are stable condition
Atoms are combining to form molecules

Answers

Atoms are combining to form molecules

Other Questions
Answer the questions and provide an explanation (if needed). ANSWER GET BRAINLIEST Solve for x: 3(x-4)=12 what is number one I keep getting to wrong? If an animal has both male and femaleparts, what is it called?A. hermaphroditeB. autotrophC. two speciesD. parasite Hadley had $25,000 he had lost 30%. what does he have left A system of equations is shown below.y = 1.5x - 3y = 1.5x + 4Which statement is true about the systemA the system has no solutionB the solution has infinitely many soulutions C the system has exactly one solution and its (0,-3)D the system has exactly one solution and its (6,4) Contrast what you have learned about the historic Native American cultures and what you know about your own culture. How are they different? _ PLZ HELP PLZ PLZ PLZ HELP Pool has a high dive platform that is 12 feet above the pool. the pool is 15 feet deep. what is the distance between the platform and the bottom of the pool When Northup describes Freeman as amiable and pious-hearted, the reader can infer that _____.Northup is being sarcastic.Northup thinks Freeman a good man.Northup feels grateful to know Freeman.Northup knows Freeman is religious. The movement of broken down pieces of rock from one place to another is calledA. Deposition B. Erosion C. Weathering D. Sediment Find the area of the rectangle please help! CAN SOMEONE PLEASE HELP ME THIS IS DUE IN 20 minutes PLEASE HELP! I have no clue how to do this! Which bond would require more energy to break apart? (Short bond or Long bond). Explaina) longer bond. because the charges are further apartb) shorter bond. because the charges are closer togetherc) shorter bond. because the charges are both positived) longer bond. because the charges are closer together Bro what is the answer for this?:During McKinleys presidency, Congress passed the ______________ Act, which McKinley supported Which resources are found in south east Asia Please answer each of the following questions in complete sentences.Primary colors are mixed together to make other colors, so primary colors are a foundation. Can you think of something else that can be used or mixed to make something new? If you need help for an idea, think of food and cooking!Imagine that you are creating a self-portrait using paint. Which colors would you use if you could only choose three? Why would you choose these three? How do you think these colors would impact the tone (or feeling) of your self-portrait?For an artist, art supplies (like paints, brushes, paper, clay etc.) are their very important tools. What are some other jobs that require specific tools or supplies in order to be successful? Please come up with at least two examples and describe the tools.Imagine that you are the owner of an art studio where artists come and share the space to create art. What are some rules that you would make to keep your art studio safe and running smoothly? Why are these rules important? List and describe at least three rules.As an artist, how would you decide which medium you are going to use? Would it depend more on the subject of your art piece or the tone (feeling) you hope to create or something else entirely? Can you think of any other mediums that you know of that were not discussed in the unit? The price of crude oil increases 50%. This will cause a change in ( supply/ quality supplied ) for crude oil. Why?