What is the heat of vaporization for a liquid and why is it useful?

Q: Classify the phase changes by the signs of the system's AH and AS. AH = + and AS = + AH = + and AS =…

A: ∆H for a chemical reaction represents the change in enthalpy of the reaction, while ΔS represents…

Q: Why is the enthalpy of vaporization for water much greater than the vaporization of fusion? What…

A: Since in case of fusion, we just try to lose the packing of the molecules from solid to liquid  And…

Q: Is dry ice evaporating  process exothermic or endothermic? Indicate the sign of ∆H.

A: Given: dry ice evaporating. The evaporation of dry ice requires input of heat energy.

Q: What are intermolecular forces? Why are intermolecularforces important?

A: intermolecular forces are the type of interactions between the atoms or molecules that helps in…

Q: 1. Why does the temperature of a boiling liquid remain constant when heat is continuously being…

A: Every substance has a definite boiling point. When a liquid is heated, then at a particular…

Q: What does not correspond to the molar heat of fusion?

A: According to the first law of thermodynamics, the total heat change of a system at constant pressure…

Q: Explain the concepts of specific heat, heat of fusion, and heat of vaporization.

A: The phase change graph explains these terms. The graph of heat supplied versus temperature exhibits…

Q: The following information is given for mercury at latm: boiling point = 357 °C AHvap(357 °C) = 59.3…

A: When a chemical reaction takes place, reactants are changed to products. As a result, the energy…

Q: How much energy is needed to boil 45.0g of water at its boiling point? Water's heat of vaporization…

A: Given: Mass of water = 45.0 g. And heat of vaporization of water = 40.65 KJ/mol.

Q: The energy needed to boil the water comes from where?

A: Water exists into three phases. These are ice, liquid water and vapors. To change one phase into…

Q: Calculate the heat needed to raise the temperature of 20 g of the substance from -70°C to 20°C.…

A:

Q: NH3, NHF2, NF3  which has the highest enthalpy of vaporization? Which has the highest vapor…

A:

Q: Isopropanol (C3H7OH, aka ‘rubbing alcohol’) has a heat of vaporization of 732.2 J/g. How many Jare…

A: Energy can be calculated as: Q = mHVap

Q: How much heat energy was lost by the liquid ethanol? How much heat energy was gained by the solid…

A:

Q: ind molar heat of fusion for ice

A: According to first law of thermodynamics,the total energy of a system remains conserved.If one…

Q: How many joules of heat energy are needed to completely change 29.0 g of water to steam at the…

A: The given data contains, mass of water = 29 g.

Q: The enthalpy of vaporization of water is larger than its enthalpy of fusion. Explain why.

A: Given:It is given that,"The enthalpy of vaporization of water is larger than its enthalpy of…

Q: 72.3 g of ice at -15.0°C has heat energy added to it until it becomes steam at 145°C. Calculate the…

A:

Q: Consider liquid dimethyl ether

A: At a particular temperature , the amount of heat energy required to convert 1 mole of a liquid…

Q: A 43.70 g sample of solid magnesium is initially at 632.00°C. If the sample is heated at constant…

A: Required information: Specific heat capacity of Mg = 1.020Jg°C Formula used:…

Q: When is the boiling point of a liquid equal to its normal boiling point?

A: The boiling point refers to the temperature at which the substance starts to boil when its rate of…

Q: What’s the latent heat of fusion of water? The latent heat of vaporization? Why do we use the term…

A:

Q: What point where ethanol begins to melt?

A: Melting point of ethanol is -114.1 °C .  The temperature at which any solid begins to melt is known…

Q: Why does water resist changes in temperature?

A: Properties of water: It is known that water is polar in nature because there is a partial positive…

Q: What are the definitions and explanantions of the four intermolecular forces?

A:

Q: A metal door opens more easily when it colder outside. The reason for this is that , as the metal…

A: Different types of materials respond differently to the temeparature changes. Metals are more…

Q: Examine the heating curve for water? Explain the significance of the slopes of each of the three…

A: The heating curve for water can be represented as follows

Q: explain (Formation of steam)

A: In solid state ,molecules of water are strongly packed ,having high forces of attraction and…

Q: How much heat is required to turn a 1 kg cube of ice at -10°C to steam at 110°C?

A: The heat is consumed in the following ways: 1. Heat required to convert 1 kg (1000 g) ice at -10°C…

Q: How many grams of benzene, C,H,, can be melted with 21.8 kJ of heat energy? The molar heat of fusion…

A: Given data: The heat energy (q)=21.8 kJ. The molar heat of fusion of benzene=9.95 kJ/mol. To find:…

Q: How much heat is required to vaporize 54.9g of acetone at its boiling point? The heat of…

A:

Q: How much heat is required to change 600. g of liquid mercury to gaseous merouty at the boiling?

A: To calculate the heat required to change the liquid mercury to gaseous mercury at its boiling…

Q: Caculate the mass of water that can be vaporized at its boiling point with 200kj of heat

A: The moles of water that can be vapourised is determined first by using the given heat value and the…

Q: Determine the enthalpy of vaporization for this substance. ΔHvap =

A: The gradient of the line lnP vs 1/T graph gives the value of ∆Hvap.

Q: The standard heat of vaporization for water is 40,700J/mol. What is the boiling point of water at a…

A: By Clausius-Clayperon equation lnP2P1= △HR(1T1- 1T2) △H=Heat of vaporizationP2 = Final  pressureP1=…

Q: The heat of vaporization for ethyl ether is 351 Jig and that for ethyl alcohol is 855 Jig. From…

A: Given: Heat of vaporization for ethyl ether = 351 J/g. And the heat of vaporization for ethyl…

Q: The greater the molar heat of vaporization of a liquid, the greater its vapor pressure. Is this true…

A: It is not true.  Explanation  As higher the molar heat of vaporization,  .more is the intermolecular…

Q: Why is molar heat of fusion lower than molar heat of vaporization?

A:

Q: what happens at the molecular level when the cold solid comes in contact with a hot liquid?

A: When a liquid is heated, its atoms vibrate faster about their fixed points.Heat causes the molecules…

Q: Illustrate how the Intermolecular Forces could differ from being Solid, Liquid, and Gas? Which of…

A: Given: Solid, liquid and gases To find: How these differ on the basis of intermolecular forces.…

Q: It is a quantity of heat need to convert  a mole of liquid into gas phase at a specified…

A: The correct option is a.  That is a.molar enthalpy of vaporization   The in correct options are :…

Q: In which phase is the potential energy at the highest level in the above heating curve?

A: In the heat curve above:E → represent solid stateD → represent  conversion from solid to liquidC →…

Q: 6. The heat of vaporization for methane (CH) is 9.2 kJ/mol. How many kJ of heat energy are required…

A: Concept is based on molar enthalpy.

Q: Which phase change involves the absorption of heat?

A: A phase change is occured when a matter changes from one state to another state. The possible states…

Q: Calculate the mass of water that can be vaporized with 211 kJ of heat at the boiling point.

A: Heat of water (q) = 211 KJ Mass of water (m) = ? • Heat is related with enthalpy of vaporization as…

Q: Explain what happens in the processes of vaporization and condensation?

A: To find: The explanation for the process of vaporization and condensation

Q: What's the heat change in Joules for vaporization of 9.00g of water at 100 degrees celcius

A: Heat of vaporization of water is 2256 J/g.Thus, when 1 mol of water is vaporised, 2256J/g heat is…

Q: Calculate the final temperature of the water after 2.47 g of zinc at 60.1 0C is added to 29.4 g of…

A: Let the final temperature be T. According to law of conservation of energy,

Q: Why does the temperature of a substance stay constant during a phase change such as vaporization?…

A: To explain : Why does the temperature of a substance stay constant during a phase change such as…

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.