Question

Develop an expression to calculate the specific entropy for water vapor assuming an ideal gas. Use the second Gibb's equation and the polynomial for specific heat at constant pressure as a function of temperature (Table A-2(c)). Enter this expression into EES separating the temperature dependent term (e.g. standard state entropy) from the pressure dependent term.

Answer #1

Using the Ideal Gas Law from the kinetic theory, develop an
expression that predicts the pressure in the vacuum chamber after
the pump has been running for a specific amount of time i.e. as a
function of time.

Determine the specific volume of superheated water vapor at 88
MPa and 712K using the ideal gas equation. Then, do this problem by
using the generalized compressibility charts.
Thanks!

1. When gas is collected over water, the gas is saturated with
water vapor with its partial pressure of water vapor dependent on
temperature. In the textbook, there is a given saturated water
vapor at various temperatures. Use that table to solve the
following problem:
During the decomposition of KClO3, 92.0mL of gas is
collected by the displacement of water at 25.0C. If the atmospheric
pressure is 756mmHg, what mass of O2 is collected?
2. (a) if you have a...

What is the increase in entropy if 14 mol of N_2 are heated
from
20.0◦C to 30.0◦C at constant pressure, assuming nitrogen behaves
as
an ideal gas?
(b) A kettle holds 1.50 kg of water. Calculate the internal
energy
increase of the water as its temperature increases from 20.0◦C
to
90.0◦C. The specific heat capacity of water is 4.18 kJ kg
−1.

A 2.0 mol sample of ideal gas with molar specific heat
Cv = (5/2)R is initially at 300 K and 100 kPa pressure. Determine
the final temperature and the work done on the gas when 1.6 kJ of
heat is added to the gas during each of these separate processes
(all starting at same initial temperature and pressure: (a)
isothermal (constant temperature) process, (b) isometric (constant
volume) process, and (c) isobaric (constant pressure) process.
Hint: You’ll need the 1st Law...

Automobiles that use hydrogen gas for fuel are currently being
developed. They emit mainly water vapor as exhaust and are less
harmful to the environment than gasoline powered cars. A chemist
combusts a certain amount of hydrogen gas in a constant pressure
calorimeter filled with 1.50 L of water. (The PM will explain in a
couple of minutes the fundamentals of how a calorimeter works). The
temperature of the water is raised by 3.70 °C. Assume the reaction
goes to...

Calculate the change in entropy for one mole of ideal gas which
expands from an initial volume of 2 L and initial temperature of
500 K to a final volume of 6 L under the following conditions.
P(initial) refers to the pressure when T(initial)= 500K,
V(initial)= 2 L.
a) Irreversible expansion against a constant pressure of
Pinitial/2
b) Irreversible expansion against a vacuum...a 'free
expansion'.
c) Adiabatic irreversible expansion against a constant pressure
of Pfinal
d) Adiabatic reversible expansion

We consider an isolated system made up of 2 moles of an ideal
gas which can pass reversibly from a state A (PA, VA, TA = 300 K)
to a state B (PB = 3PA, VB = VA / 3, TB) by a transformation which
comprises two stages: it is first isochoric (constant volume), then
isobaric (constant pressure).
1-Determine the work involved.
The ideal gas constant is R = 8.31 J / K.mol, and the internal
energy of an ideal...

An ideal monatomic gas is contained in a vessel of constant
volume 0.330 m3. The initial temperature and pressure of the gas
are 300 K and 5.00 atm, respectively. The goal of this problem is
to find the temperature and pressure of the gas after 24.0 kJ of
thermal energy is supplied to the gas.
(a) Use the ideal gas law and initial conditions to calculate
the number of moles of gas in the vessel. Your response differs
from the...

A storage tank contains liquid water at 50oC and is vented to
atmosphere at the top (where atmospheric pressure = 101.3 kPa). The
distance from the bottom of the tank to the liquid surface level is
1.55 m. What will be the absolute pressure at the bottom of the
tank?
(A) 12.35 kPa (B) 116.3 kPa (C) 201.3 kPa (D) 113.65 kPa
The pressure of an ideal gas drops significantly as it flows
under steady state conditions through an insulated...

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