An object at 20∘c absorbs 25.0 j of heat. what is the change in entropy δs of the object?
2 answers:
From the definition of entropy, the entropy change of an object is
where
Q is the heat absorbed
T is the absolute temperature
in our problem, we have Q=25.0 J, while the absolute temperature is (converting in Kelvin)
and so the entropy change is
where
Q is the heat absorbed
T is the absolute temperature
in our problem, we have Q=25.0 J, while the absolute temperature is (converting in Kelvin)
and so the entropy change is
ΔS of the object : <u>0.085324 J mol/K</u>
<h3>Further explanation </h3>Entropy (with the symbol S) in thermodynamics indicated the degree of system disorder
Entropy like other thermodynamic terms can only be calculated from the initial and final changes
Entropy will also change in the process of changing energy forms
The value of ΔS ° can be calculated from standard entropy data
<h3>∆S ° (reaction) = ∑S ° (product) - ∑ S ° (reagent) </h3>Entropy can also be calculated from the change in heat (ΔQ) to temperature (T), under Isothermal process (constant temperature) conditions
From this equation it can be seen that entropy will rise if the temperature gets lower (hot to cold)
An object at 20°C absorbs 25.0 j of heat
T = 20 + 273 = 293 K
ΔQ = 25 J
then:
Entropy: ΔS =
Delta H solution
an exothermic reaction
as endothermic or exothermic
an exothermic dissolving process
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Answer:
Decrease
Explanation:
I = Current = 3.7 A
e = Charge of electron =
n = Conduction electron density in copper =
= Drift velocity of electrons
r = Radius = 1.23 mm
Current is given by
The drift speed of the electrons is
From the equation we can see the following
So, if the number of conduction electrons per atom is higher than that of copper the drift velocity will decrease.
Answer:
C. Pressure gradient equals gas flow over resistance.
Explanation:
As we know that pressure gradient is the driving force for the gas to flow from one point to other point
And we know that the flow rate is directly proportional to the driving force and it inversely depends on the resistance to flow
so we can say
Flow Rate =
Flow Rate =
so we can say that correct statements are as below
A. Gas flow equals pressure gradient over resistance.
B. Resistance equals pressure gradient over gas flow.
D. The amount of gas flowing in and out of the alveoli is directly proportional to the difference in pressure or pressure gradient between the external atmosphere and the alveoli.