6 5. Explain why boiling water is an endothermic process. (Hint: Think about what is happening to the attractive forces between water molecules.) 8750 Lof!

Q: 3. Water has a vapor pressure of 17.5 torr at 20 °C, at what temperature does water have a vapor…

A:

Q: (a) If 83.0 g of ice at 0.0oC is placed in 235mL of water at 28.0oC, find the final temperature of…

A:

Q: Given that a 10.0 g sample of ice at 0.0 °C melts and then the resultant water proceeds to warm to…

A:

Q: There are three sets of sketches below, showing the same pure molecular compound (hydrogen chloride,…

A: Given Molecule: HClMelting point of HCl : -114.8 oCBoiling point of HCl: -85.1 oCGiven temperature…

Q: Based on the thermodynamic properties provided for water, determine the energy change when the…

A: Mass of water = 0.350 kg = 350 g Molar mass of water = 18 g/mol Moles of water = 350 g / 18 g/mol =…

Q: 5. The normal melting point of water is 0°C the normal boiling point is 100°C. The heat of…

A: Scientists describe heat as thermal energy transmitted between two systems at different temperatures…

Q: What amount of energy is required to change a spherical drop of water with a diameter of 1.60 mm to…

A: Q. GivenD= 1.60 mm = 0.0016 m (Diameter of bigger droplet)R = 0.8 mm = 0.0008 m ( Diameter of bigger…

Q: 2. Calculate the amount of energy absorbed when 75g ice @ -4°C melts to 31°C. Did a phase change…

A: The change from -4°C to 31°C will have three process involved :  a ) Heating of ice from -4°C to 0°C…

Q: Determine the normal boiling point of a liquid with vapor pressure 63.8 mmHg at 36.50 degrees  C ,…

A: Given Information -  P1 = 63.8 mmHg T1  = 36.50 + 273 K = 309.50 K P2  = 760 mmHg T2  = ?  ∆Hvap =…

Q: The actual value for the heat of fusion of ice is 6.02 kJ/mol. If the experimental value that was…

A: The two possible reasons are  1) The ice cube would be dry . For accuracy the ice should be wet .

Q: Explain why each of these properties is important to sustaining life. Please use your own words and…

A:

Q: Determine the normal boiling point of a liquid with vapor pressure 63.8 mmHg at 56.50°C, given that…

A: Given: P1= 1 atm= 760 mm Hg P2= 63.8 mm Hg T2= 56.50°C= 56.50+273.15 K= 329.65 K ∆Hvap=43.5 kJ/mol…

Q: A 221.0 g sample of water at 24.5°C is heated to steam at 139.0°C. How much heat was absorbed?

A:

Q: Which statement below would be accurate about freezing water (AH°tus for water 40.7 kJ/mol) ? O…

A: When the heat is released  from system  the process is exothermic.

Q: What will the final temperature (in be if you add 400 kJ of heat to 1.00 L of water at 20 °C? The…

A: When heat is given to water, the temperature of water will increase.this increase in temperature is…

Q: A 0.503 g sample of steam at 106.7 °C is condensed into a container with 5.52 g of water at 16.9 °C.…

A: We know that,  q = mC∆T Where, q = heat m = mass C = specific heat ∆T = change in temp = Tinitial -…

Q: Consider the phase diagram of carbon dioxide. What is the critical temperature of carbon dioxide?…

A: Phase diagram: The phase diagram represents the different phases of the substance and the pressure…

Q: Suppose that 117.2 J of heat energy is required to completely vaporize 4.3 g of a pure liquid. If…

A:

Q: Draw an energy diagram, for this phase change: NH3(l) → NH3(g).

A: An energy diagram is drawn by taking Energy on X-axis and Temperature on Y-axis. During phase…

Q: None

A: In Sketch A, the molecule of HCl is shown in a solid state. This is because the melting point of HCl…

Q: The heat of vaporization of an organic solvent is 39.8 kJ/mol. Find the temperature in degrees…

A: The variation of vapor pressure of a liquid with respect to temperature is given by…

Q: At 760 torr, 100 grams of benzene is vaporized at its boiling point of 80.2°C. Calculate AU (in…

A: Given,  ∆H = 94.4 cal/g  T = 80.2°C  Mass of benzene = 100 grams

Q: A scientist is comparing the properties of the molecules HF and HCl. Unfortunately, he mixes up the…

A: The boiling point of the solution is the temperature at which liquid starts to boil. The…

Q: 6. Suppose 1.0 x 102 grams of ice absorbs 1255 J of heat, reaching a final temperature of -2.0°C.…

A: Q = m . s . (T2 - T1)

Q: A 193.1 g sample of water at 21.2°C is heated to steam at 131.5°C. How much heat was absorbed?

A:

Q: Is a phase change a chemical change? Why or why not?

A: In chemical changes, the new composition of elements is formed.

Q: How much heat (in J) is released when 0.9 L of water freezes at 0.0°C? The heat of fusion of water…

A: When water freezes heat is released. this is an exothermic process.

Q: A 25.0-g sample of ice at 0.0°C is added to 125 g of water, initially at 35.0°C. What is the final…

A: q1+q2=−q3.... (1), where q1 - the heat absorbed by the solid at  0∘C q2 - the heat absorbed by the…

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: There are three sets of sketches below, showing the same pure molecular compound (carbon monoxide,…

A:

Q: How much heat is necessary to melt a block of ice that is 2.75 cm X 6.48 cm X 17.32 cm? (Density of…

A: When an ice block melted it absorbs heat and the required heat at a constant temperature is known as…

Q: Calculate the amount of heat (in joules) required to heat 43 grams of water from 28°C to the…

A: Given, mass of water = 43 g Initial temperature (Ti) = 28°C Final temperature (Tf) = 100°C Amount of…

Q: How many kilojoules of heat energy are absorbed by a 200. g block of ice from -10 C to 0 C?

A: Solution-  Given Temperature-  00C to - 100C heat energy are absorbed by block of ice =200. g…

Q: Suppose 1.0 x 102 grams of ice absorbs 1255 J of heat, reaching a final temperature of -2.0°C. What…

A: Given: The mass of ice = 1.0×102 g = m  The amount of heat absorbed by ice = 1255 J = Q The final…

Q: determine the amount of energy released for 130.0  g of water to go from 89.0 °C to -12.0 °C.

A:

Q: Two 20.0 g ice cubes at -17.00C are placed into 470.1 g of water at 25.0 0C. The heat of fusion of…

A: According to the question, Mass of one ice cube = 20.0 g  Mass of water = 470.1 g The heat of fusion…

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.    

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.