Question

a) show that for a solid steam, it behaves like an ideal gas, the sublimation curve has the form P = -B / T + A where A and B are constants. b) For Mg at 700k, B 7527. Calculate the heat of sublimation of Mg at this temperature in cal / mol. c) Is the equation deduced in a) useful to determine the sublimation curve?

Answer #1

Consider the Ideal Gas Law, which states that PV = nRT, where P
is the pressure, V is the volume, T is the temperature, and n is
the number of moles of a gas sample, and R is a constant. (a)
Assume a sample of 1 mole of a gas is in a expandable container
where temperature and pressure are allowed to vary. Solve this
equation for V = f(P,T).
(b) Determine ∂V/dP and interpret the result. In particular,
describe...

As will be discussed in detail in Chapter 5, the
ideal-gas equation of state relates absolute pressure, P(atm); gas
volume, V(liters); number of moles of gas, n mol ; and absolute
temperature, T(K): PV 0:08206nT
(a) Convert the equation to one relating P psig , V
(ft3) , n (lb-mole) , and T (°F) .
(b) A 30.0 mole%CO and 70.0 mole%N2 gas mixture is
stored in a cylinder with a volume of 3.5ft^3 at a temperature of
85°F. The...

The ideal gas law
PV=nRT
relates pressure P, volume V, temperature
T, and number of moles of a gas, n. The gas
constant Requals 0.08206 L⋅atm/(K⋅mol) or 8.3145
J/(K⋅mol). The equation can be rearranged as follows to solve for
n:
n=PVRT
This equation is useful when dealing with gaseous reactions
because stoichiometric calculations involve mole ratios.
A)When heated, calcium carbonate decomposes to yield calcium
oxide and carbon dioxide gas via the reaction
CaCO3(s)→CaO(s)+CO2(g)
What is the mass of calcium carbonate...

± Stoichiometric Relationships with Gases
The ideal gas law
PV=nRT
relates pressure P, volume V, temperature
T, and number of moles of a gas, n. The gas
constant Requals 0.08206 L⋅atm/(K⋅mol) or 8.3145
J/(K⋅mol). The equation can be rearranged as follows to solve for
n:
n=PVRT
This equation is useful when dealing with gaseous reactions because
stoichiometric calculations involve mole ratios.
Part A
When heated, calcium carbonate decomposes to yield calcium oxide
and carbon dioxide gas via the reaction
CaCO3(s)→CaO(s)+CO2(g)...

The van der Waals equation of state is (P + a(n/V )^2)(V/n − b)
= RT, where a and b are gas-specific constants. For Hydrogen gas, a
= 2.45 × 10^-2P a · m^6 and b = 26.61 × 10^-6m^3/mol, while for an
ideal gas a = b = 0. (a) Consider trying to measure the ideal gas
constant in a lab from the relation R = P V/(nT), where P, V, n,
and T are all measured parameters. However,...

Carbon dioxide (CO2) gas is compressed at steady state from 0.8
bar and 17 °C to 3.5 bar with a compressor drawing 10 kW of power.
The CO2 flows through the compressor at a rate of 0.1 m3/s through
an inlet orifice that is 200 cm2. The gas leaves the compressor at
a velocity of 12 m/s. Heat loss from the compressor to the
surroundings is roughly 2% of the power fed to the compressor. In
addition to the Give,...

The Noyes-Whitney equation is often used to predict the rate at
which a solid substance dissolves into water. One form of this
equation is: dC/Dt = k(CS-C) where k=DA/Vh . Here D is the
diffusivity of the dissolving substance in the electrolyte, A is
the area of the sample dissolving, h is the thickness of the
diffusion boundary layer, V is the volume of electrolyte, C is the
time-dependent concentration of the substance in the electrolyte
and Cs is the...

2 Equipartition The laws of statistical mechanics lead to a
surprising, simple, and useful result — the Equipartition Theorem.
In thermal equilibrium, the average energy of every degree of
freedom is the same: hEi = 1 /2 kBT. A degree of freedom is a way
in which the system can move or store energy. (In this expression
and what follows, h· · ·i means the average of the quantity in
brackets.) One consequence of this is the physicists’ form of...

A weather balloon contains 222 L of He gas at 20. °C and 760.
mmHg. What is the volume of the balloon when it ascends to an
altitude where the temperature is -40. °C and 540. mmHg?
1
What volume does 12.5 g of Ar gas at a pressure of 1.05 atm and
a temperature of 322 K occupy? Would the volume be different if the
sample were 12.5 g of He gas under the same conditions?
How many moles...

a) A mildly restored ‘Knight-Rider’ 1989 Pontiac Trans Am GTA
powered by a 5.7 litre V8 can do a quarter mile S from rest in a
time t of about 15 seconds. Using distance: S=a t2 /2 , force: F=ma
and work: W=FS, calculate the amount of work (energy) in kJ
required to do the standing quarter mile given that the mass (m) of
this Trans Am is 3,500 pounds. Assume that the acceleration (a) is
constant. (This is not...

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