Dry nitrogen gas (100.0 L) was bubbled through liquid ethanol, C2H5OH, at a given temperature and the evaporated ethanol condensed; its mass was then measured. Using the data below, calculate the heat of vaporization (kJ/mol) of ethanol?

Q: Which process will require the LEAST heat to occur? Heating 20.0 g of ethanol (c = 2.428 J/g · °C)…

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Q: CaCl2 (MM = 110.98 g/mol) is used as road salt in the winter to minimize the accumulation of ice on…

A: On adding dissolving CaCl2, the temperature will change from initial value. Heat absorbed by water…

Q: One 63-g ice cube at 0.0 °C is dropped into 5.00 × 10² mL of tea to make iced tea. The tea was…

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Q: The heat of vaporization of C₆H₆ at 1 atm is 94.4 cal/g. 100 g of C₆H₆ reacted at 80.2°C. Calculate…

A: Given: Mass of C6H6 = 100 g Heat of vaporization of C6H6 = 94.4 cal/g. External pressure = 1 atm.…

Q: 2. How much heat, in kilojoules, is needed to raise the temperature of 236 g of silver from 8.5oC to…

A: Given, mass of silver, m=236 g initial temperature, Ti=8.5°C Final temperature, Tf= 34.9°C Specific…

Q: A calorimeter contains 150 g water. The calorimeter and the water inside are both at 22 °C. A piece…

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Q: The specific heat capacity of copper is 0.384 J /g* degrees C. What is the molar specific heat…

A: For copper, Specific heat capacity, Cs = 0.384 J / g ℃ Molar mass, M = 63.54 g mol-1 Molar heat…

Q: Calculate amount of heat (in kJ) required to raise the temperature of a 79.0 g of a substance by…

A: The solution is as follows:

Q: Duncan knows that it takes 36400 calcal of energy to heat a pint of water from room temperature to…

A: Duncan knows that it takes 36400 calcal of energy to heat a pint of water from room temperature to…

Q: the heat of vaporization of water is 2260 J/g. determine q when 100 g of steam at 100 C is condensed…

A: Given that  Temperature = 100°C  heat of vaporization = 2260j/mol…

Q: A 450 g H2O is heated from 10.5oC to 80.0oC. Calculate the amount of heat absorbed (in kilojoules)…

A: We have to predict the amount of heat absorbed.

Q: 3.15 mol of an unknown solid is placed into enough water to make 150.0 mL of solution. The…

A: Given moles (n) = 3.15 volume = 150 ml Temperature difference = 20.11°C specific heat (C) = 4.184…

Q: The molar heat of vaporization of ethanol is 39.3 kJ/mol and the boiling point of ethanol is 78.3°C.…

A: Entropy change of vaporization can be calculated by the following formula. ∆S=∆HvapT∆S=Entropy…

Q: Energy Constants for H2O 334 J/g = Heat of Fusion (Hf) 2260 J/g = Heat of Vaporization (Hv) 2.11…

A: The question is based on the concept of Hess law. it states that net enthalpy change remains…

Q: Consider the dissolution of CaCl2: CaCl2 (s) → Ca+ (ag) + 2 Cl (aq) AH = -81.5 kJ An 11.8-g sample…

A: Calculate the heat released when 11.8 g of CaCl2 is dissolved:

Q: Acetylene, C2H2, is used in welding torches.  It releases a lot of energy when burned in oxygen.…

A: Given: One gram of acetylene releases 48.2 kJ The mass of the sample of acetylene is 0.82 g The heat…

Q: What is the definition of the specific heat capacity of a substance? the amount of heat required to…

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Q: Acetylene, C2H2, is used in welding torches.  It releases a lot of energy when burned in oxygen.…

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Q: 1.75g CaCl2 dissolves 125g H2O in calorimeter, temp increases 2.44 degrees. what is heat change per…

A: Given that, Amount of CaCl2  w = 1.75 g Molar mass of CaCl2  Mw  = 110.98 g/mol Weight of water in…

Q: A 33.5-ml sample of benzene at 39.2°C was cooled to its melting point, 5.5 °C, and then frozen at…

A: Volume of benzene = 33.5ml Density of benzene = 0.876g/ml Ti = 39.2∘C Melting point = 5.5°C Cpl =…

Q: A 25.0 g sample of lead, specific heat = 0.128 J/goC, was warmed from 35.0 oC to 200.0 oC. The same…

A: The total amount of heat absorbed by the lead is; Q=mc∆T=25.0 g×0.128 J/g oC×200.0oC-35.0oC=528 J

Q: A gold coin whose mass is 8.75 g is heated to 121.1°C and then quickly dropped into an ice…

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Q: A 4.3 kg sample has specific heat 4.1 kJ/(kg °C) and initial temperature 69 °C.What will be the…

A: Given, mass of sample =4.3 kgspecific heat =4.1 kJ/kg.°Cinitial temperature =69 °Cheat absorbs =120…

Q: Consider the dissolution of CaCl2 : CaCl2 (s) → Ca2+ (ag) + 2 C1-(ag) AH = -81.5 kJ An 11.7-g sample…

A: ΔH = -81.5 kJ of 1 mol CaCl2 Molar mass of CaCl2 = 110.98 g /mol Moles of CaCl2 present in solution…

Q: a) A person drinks four glasses of cold water (3.0°C) every day. The volume of each glass…

A: Given: volume=2.6×102 mLInitial temperature=3.0oCFinal temperature=37oC To find: Heat supplied

Q: Using a coffee-cup calorimeter it was found that when an ice cube weighing 24.60 g melts, it absorbs…

A: ∆H ( enthalpy of fusion ) for this melting process is calculated in kJ/mol using formula :  ∆H = q /…

Q: 2. If a 50g sample of water at a temperature of 95°C is added to 89g sample of water at 25°C, what…

A: Given: mass of water

Q: The familiar "ether" used as an anaesthetic agent is diethyl ether, C4H20O. Its heat of vaporization…

A: According to the mole concept, in terms of mass, the amount of substance in moles is equal to the…

Q: Calculate the amount of heat absorbed by a 40.0 g sample of water at 21 °C when the temperature is…

A: The amount of heat absorbed by water is 2.3 kJ. Correct option -- 2.3 kJ

Q: AH°, of H,O, is -285.8 KJ/mol and AH°, of H,O is -241.8 KJ/mol, then e AH°, of condensation of H,O,…

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Q: 1. The phase change between graphite and diamond is difficult to observe directly. Both substances…

A: According to Hess's law, the standard enthalpy change for a reaction is the sum of the standard…

Q: 67.0 mL of hot water (45.4 oC) is added to 45.0 mL of cold water (22.3 oC).  Upon mixing the water…

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Q: The following information is given for mercury, Hg, at 1 atm: boiling point = 357 °C AH ap(357 °C) =…

A: The change in enthalpy of a chemical reaction is the total amount of heat released or absorbed in…

Q: Which of the substances have a standard heat of formation (AH;) of zero? Fe at 1200 °C 0,(g) at 25.0…

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Q: The heat absorbed or liberated by a substance (q) can be calculated using the following equation: q…

A: Matter exists in different states. Solid, liquid, gas are the three states of matter.  Change of…

Q: How much heat is absorbed by 20 g of gold when it is heated from 25oC to 35oC? The specific heat of…

A:

Q: Energy Constants for H2O 334 J/g = Heat of Fusion (Hf) 2260 J/g = Heat of Vaporization (Hv) 2.11…

A: Answer:- This question is answer by using the simple concept of calorimetry which state that heat…

Q: 3. What mass of aluminum metal would absorb 250.0 ķJ when it melted at its melting point? The molar…

A: Heat absorb by Al is given and molar enthalpy of fusion for aluminium is also given so apply formula…

Q: Which produces more heat?Os(s) ⟶ 2O2(g) ⟶ OsO4(s)orOs(s) ⟶ 2O2(g) ⟶ OsO4(g)for the phase change…

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Q: 76. The evaporation of water is endothermic: H2O(1) – → H,O(g) AHxn = +44.01 kJ %3D What minimum…

A: The evaporation of water is an endothermic process. The enthalpy of evaporation is given by: The…

Q: If a 50g sample of water at a temperature of 100 oC is added to a 25g sample of water at 25 oC, what…

A:

Q: A gold coin whose mass is 8.47 g is heated to 138.9oC and then quickly dropped into an ice…

A: Given: The mass of a gold coin is 8.47 g. The initial temperature of the coin is 138.9°C. The molar…

Q: If 75.4 J of energy is absorbed by 0.25 mol of CCl4 at constant pressure, what is the change in…

A: Given, 75.4 J of energy is absorbed by 0.25 mol of CCl4 at constant pressure specific heat of CCl4…

Q: The following information is given for benzene, C6H6, at 1atm: AHvap(80.1 °C) = 30.7 kJ/mol boiling…

A: Here, we have to find the ∆H for the process of condensing 47.4 g of gaseous benzene at its normal…

Q: The specific heat capacity of liquid bromine is 0.226 J g^−1 K^−1. How much heat is required to…

A: In this question, we have to calculate the heat needed to raise the temperature of 31.2 g of bromine…

Q: The burning of 28g of vegetable cause the temperature of 58.18 g of water in a soda can calorimeter…

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Q: Calculate the ΔS of vaporization (in J/mol∙K)  which boils at 728.7 oC. Its heat of vaporization,…

A: Given ΔS = ? ΔH°vap = 82.8 kJ/mol boiling temperature (Tb) = 728.7°C

Q: Which material will show the smallest temperature change upon absorbing the same amount of heat (SH…

A: The heat required to raise the temperature of 1 g of a substance by 10C is known as specific heat…

Q: Suppose 2.32 kJ of heat is added to 25.4 g of ethanol at 18.71 °C. The specific heat capacity of…

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Q: Calculate the amount of heat (in kJ) required to raise the temperature of a 86.0 g sample of ethanol…

A: The temperature change (ΔT) is given.