Homework Answers
Here we apply concept of thermodynamics and definition of internal energy and enthalpy as well as first law of thermodynamics.
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1. A parcel of air is heated isobarically from 20.0°C to 30.0°C. a. What is the...
a) A sealed container filled with an ideal gas is heated such that it expands isobarically...
a) A sealed container filled with an ideal gas is heated such that it expands isobarically from a volume of 1 m^3 to 3 m^3 at a pressure of 1 kPa. How much work is done by the gas? b) The gas is then heated isochorically to a pressure of 2 kPa. How much work is done by the gas? c) The gas now has a volume of 3 m^3 and a pressure of 2 kPa. If there are 2...
Problem 6.14 Humidity and Condensation Air at 30.0% relative humidity is cooled isobarically at 1 atm...
Problem 6.14 Humidity and Condensation Air at 30.0% relative humidity is cooled isobarically at 1 atm absolute from 90.0°C to 35.0°C. a. Estimate the dew point and the degrees of superheat of the air at 90.0°C. Dew point: Degrees of superheat: doc b. How much water condenses (mol) per cubic meter of feed gas? (See Example 6.3-2) mol c. Suppose a sample of the 90.0°C air is put in a closed variable-volume chamber containing a mirror and the pressure is...
One mole of methane gas (CH4) is heated isobarically at a pressure of 1 atm from...
One mole of methane gas (CH4) is heated isobarically at a pressure of 1 atm from 82.2 ° C to 211.9 ° C in a cylindrical piston device with condensed steam from saturated vapor to fully condensed at 250 ° C. a. If methane is considered an ideal gas, calculate ΔU, ΔH, ΔS, ΔG (in Joule) b. Calculate work (W) and heat involved (Q), (in Joule). c. Calculate the change in environment, and the total entropy generated by this process...
A cylinder if fitted with a floating piston oriented horizontally (the gas is the system and...
A cylinder if fitted with a floating piston oriented horizontally (the gas is the system and by having a floating piston it maintains constant pressure). It contains 26.0 L of argon at 30.0C and 1 bar pressure. The system is then heated to 300.0C. Argon can be considered a monatomic gas and therefore would have a Cv = 3R/2, where R is the ideal gas constant. Also for gases Cp = Cv +R. (pay attention to the units). If you...
1 mol of Ne is heated from 3ook to 420k at constant pressure, Compute Cp-20.79 moth...
1 mol of Ne is heated from 3ook to 420k at constant pressure, Compute Cp-20.79 moth everyn transferred to the vin heut. (Q) 67 The change in internal energy (ou) Ps . c) The work done a. The gers of the the gas. on nale i Ne gas is monoa fonică
The amount of heat needed to raise the temperature of 1 mole of a substance by...
The amount of heat needed to raise the temperature of 1 mole of a substance by one Celsius degree (or, equivalently, one kelvin) is called the molar heat capacity of the system, denoted by the letter C. If a small amount of heat dQ is put into n moles of a substance, and the resulting change in temperature for the system is dT, then C=1ndQdT. This is the definition of molar heat capacity--the amount of heat Q added per infinitesimal...
Air at 50% relative humidity is cooled isobarically at 1 atm absolute from 90⁰C to 25⁰C....
Air at 50% relative humidity is cooled isobarically at 1 atm absolute from 90⁰C to 25⁰C. a) Estimate the dew point and degrees of superheat of the air at 90⁰C. b) How much water condenses (mol) per cubic meter of feed gas? c) Suppose a sample of the 90⁰C air is put in a closed variable-volume chamber containing a mirror and the pressure is raised at constant temperature until a mist forms on the mirror. At what pressure (atm) would...
A lead block of mass 7.0 kg is originally at a temperature of 15°C and 1 atm. It is then heated to a temperature of 64°...
A lead block of mass 7.0 kg is originally at a temperature of 15°C and 1 atm. It is then heated to a temperature of 64°C without any change in pressure. The specific heat of lead is 128 J/(kg - °C), its density is 1.13 x 104 kg/m3, and the coefficient of linear expansion is 29 x 10 -6/oC (a) Determine the work done by the lead block (b) How much heat energy is transferred during this process? J (c)...
Chlorine gas is to be heated from 125 °C and 1 atm to 175 °c. (a)...
Chlorine gas is to be heated from 125 °C and 1 atm to 175 °c. (a) Calculate the heat input ( W) required to heat a stream of the gas flowing at 5.0 kg's (b) Calculate the heat input (kJ) required to raise the temperature of 5.0 kg of chlorine in at constant pressure. a closed rigid vessel from 125 °C and 1 atm to 175 °C. (Suggestion: Evaluate the change in specific internal energy directly from the result of...
One mole of an Ideal Gas, for which Cv,m = 3/2R, initially at 20.0 C and...
One mole of an Ideal Gas, for which Cv,m = 3/2R, initially at 20.0 C and 1.00 x106 Pa undergoes a two-stage transformation: Stage 1: The gas is expanded isothermally and reversibly until the volume doubles. Stage 2: Beginning at the end of the first stage, the temperature is raised to 80.0 C at constant volume. For each stage, calculate the final pressure, heat(q), work(w), change in internal energy (ΔU), and enthalpy (ΔH). Calculate the total q, w, ΔU, and...
Problem 6.14 Humidity and Condensation Air at 30.0% relative humidity is cooled isobarically at 1 atm absolute from 90.0°C to 35.0°C. a. Estimate the dew point and the degrees of superheat of the air at 90.0°C. Dew point: Degrees of superheat: doc b. How much water condenses (mol) per cubic meter of feed gas? (See Example 6.3-2) mol c. Suppose a sample of the 90.0°C air is put in a closed variable-volume chamber containing a mirror and the pressure is...
1 mol of Ne is heated from 3ook to 420k at constant pressure, Compute Cp-20.79 moth everyn transferred to the vin heut. (Q) 67 The change in internal energy (ou) Ps . c) The work done a. The gers of the the gas. on nale i Ne gas is monoa fonică
A lead block of mass 7.0 kg is originally at a temperature of 15°C and 1 atm. It is then heated to a temperature of 64°C without any change in pressure. The specific heat of lead is 128 J/(kg - °C), its density is 1.13 x 104 kg/m3, and the coefficient of linear expansion is 29 x 10 -6/oC (a) Determine the work done by the lead block (b) How much heat energy is transferred during this process? J (c)...
Chlorine gas is to be heated from 125 °C and 1 atm to 175 °c. (a) Calculate the heat input ( W) required to heat a stream of the gas flowing at 5.0 kg's (b) Calculate the heat input (kJ) required to raise the temperature of 5.0 kg of chlorine in at constant pressure. a closed rigid vessel from 125 °C and 1 atm to 175 °C. (Suggestion: Evaluate the change in specific internal energy directly from the result of...
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