1. White phosphorus is a molecular solid made of molecules of P4. A 1.52 g sample of white phosphorus starts at 20oC. Calculate the amount of heat (in J) required to melt the sample. Use the following data: Tp = 44oC; C = 94 JoC-1 mol-1; ΔHfusion = 2.5 kJ/mol.

Q: a) What is the heat of vaporization of carbon tetrachloride, in kJ?

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

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Q: How much energy must be removed from a 94.4 g sample of benzene (molar mass= 78.11 g/mol) at 322.0 k…

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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: 15. Calorimetry a. How much heat needs to be taken from 0.5 kg of ethyl alcohol as a gas at its…

A: Q = mc∆T   Q = heat energy (Joules, J), m = mass of a substance (g)   c = specific heat (units…

Q: 12.2 g of ice at-68.3 °C is converted to ste am at 297.1 °C. Match the heat added to the process it…

A: Here, 12.2 g of ice at -68.30C is converted to steam at 297.10C. This can be solved using the phase…

Q: How much energy is required to melt 13.00 kg of ice at 273 K? The specific latent heat of fusion of…

A: Given,  The mass of ice = 13.00 Kg.  The latent heat of fusion of ice = 3.36×105 J/Kg. The required…

Q: Which substance has the lowest vapor pressure at 25C ?   a. H2S   b. O2   c. H2O   d. CO2

A: Vapour pressure may be defined as:-…

Q: 50.0 grams of ethanol are heated from -120.°C to 25.0°C how many joules were required? Ethanol heat…

A: Given : Mass of ethanol = 50.0 g Initial temperature of ethanol = -120 oC And final temperature of…

Q: The following information is given for manganese at latm: boiling point 2095 °C AHap(2095 °C) = 225…

A: Molar mass of Manganese= 54.94g/mol  Fusion is the process in which solid is converted into liquid.…

Q: 2. Calculate the amount of heat needed to melt 2.00 kilogram of iron at its melting point (1,809 K),…

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Q: Using the provided data, calculate the amount of heat, in kJ, required to warm 27.3 g of solid…

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Q: Liquid ethanol has a normal boiling point of 78.3 degrees celcius and has a heat if vaporization of…

A:

Q: What gas law states that pressure and temperature are directly proportional at constant volume and…

A: At constant volume and moles formula is   P1/T1 = P2/T2

Q: 83. Solid iodine has a vapor pressure sublime into a 500 mL flask at this te constant temperature,…

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Q: The enthalpy of vaporization of Substance X is 17.0 -156. °C. Round your answer to 2 significant…

A: Here, we have to use the Clausius-Clapeyron equation to find the vapor pressure of X at . The…

Q: 13.1 g OF liquid mercury at 25.00 °C is converted to solid mercury at its melting point. Constants…

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Q: Two students measure the vapor pressure of the same unknown organic liquid and compare results. The…

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Q: Given the thermodynamic information below for ethylene glycol (molar mass = 62.068 g/mol): Normal…

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

A: Accoding to Clausius Clapeyron equation,At normal boling point, the vapor pressure equal= 760 mmHg

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: calculate the quantity of energy in kj required to change 73.92 grams of liquid water at 38.8…

A: The liquid water is heated to raise the temperature from 38.8 to 100 degree Celsius. Then conversion…

Q: 72.9- Part A Critical point atm LIQUID Triple point SOLID Using the phase diagram provided, identfiy…

A: Phase diagram is a graph between pressure on y-axis and temperature on x-axis. With the changes in…

Q: From the following vapor pressure data for ethanol, an estimate of the molar heat of vaporization of…

A: According to the celsius clapeyron equation, ln(P2 / P1 ) = (-ΔHvap / R) X ( 1/T2 - 1/T1)  where P2…

Q: A certain liquid has a vapor pressure of 92.0 Torr at 23.0 °C and 279.0 Torr at 45.0 °C. Calculate…

A: Given : We have to calculate delta H vaporization and normal boiling point.

Q: Platinum has ΔHvap= 510.4kJ/mol and ΔSvap= 124.7 J/K•mol What is the appropriate boiling point of…

A: It is given that change in enthalpy of vaporization for platinum is 510.4 kJ/mol and change in…

Q: Standard enthalpy of fusion of silver at 1234K is 11.30 kJ/mol. How much energy (kJ) is required to…

A: Moles=91107.8682=0.843 mol

Q: (c) Calculate the specific heat of the metal 9. How much energy is required to change 50.0 g ice at…

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Q: The enthalpy of fusion of Na is 2 kJ/mol.  The enthalpy of vaporization of Na is 98 kJ/mol.…

A: Since the metal is converted from gas to solid  And since 2 moles of Na is being converted in the…

Q: Calculate the heat energy released when 20.6 g of liquid mercury at 25.00 °C is converted to solid…

A: Given : Mass of mercury = 20.6 g Initial temperature of mercury = 25.00 oC = 273.15 + 25.00 = 298.15…

Q: An ice cube with a mass of 54.2 g at 0.0 °C is added to a glass containing 352 g of water at 45.0…

A: we have to calculate the final temperature of the system

Q: The molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively,…

A: Molar heat of fusion of water = 6.02 kJ/mol  Molar heat of vapourisation of water = 40.6 kJ/mol…

Q: How much heat is released ( in J) when 54.0 g of water at 10.0 °C is cooled to form ice at - 10.0…

A: Given the mass of water, m = 54.0 g  The initial state is water at 10.0 oC.  The final state is ice…

Q: The enthalpy of vaporization of water is 40.7 kJ/mol at its boiling point (100°C). Determine Ssys,…

A: Enthalpy of vaporization = 40.7 KJ/mol = 40700 J/mol  Boiling point = 100°C = 100+273 = 373 K ∆Ssym…

Q: 3. The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling…

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Q: 15) Liquid ammonia, NH3(1), was once used in home refrigerators as the heat transfer fluid. The…

A: The total energy required can be divided into three parts. The energy required to heat the liquid…

Q: The AHvap of a certain compound is 34.40 kJ · mol-1 and its ASyap is 60.47 J · mol-! . K-1. What is…

A:

Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.