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dangina [55]
3 years ago
10

What is the change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies.

Chemistry
1 answer:
Rainbow [258]3 years ago
7 0

Answer: The change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies is 20 cal/K.

Explanation:

Pb(l)\rightleftharpoons Pb(s)

\Delta S=\frac{q}{T}

{\text{Change in entropy}}=\frac{heat}{Temperature}

T is the temperature at which the process is carried out, here the temperature is constant, 327.5°C = (273+327.5)K=600.5K ,because only phase change occurs.

q =  heat given in the process = m\times L_f

m = mass of lead = 2.0 kg

L_f = latent heat of fusion of lead =  5.9 kcal/kg

\Delta S=\frac{2kg\times 5.9kcal/kg}{600.5K}

\Delta S=0.02 kcal/K=20cal/K

Thus the change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies is 20 cal/K.

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In a mixture of 2 ideal gases, A and B, PA = 0.2PB, what is the mole fraction of A?
Alborosie

Answer:

0.1667

Explanation:

Hello,

Dalton's law defines:

y_i=\frac{P_i}{P_T}

A total pressure is:

P_T=P_A+P_B

So, for A (solving for P_A in the previous equation, we get:

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Since P_A=0.2P_B, we obtain:

y_A=\frac{P_A}{P_A+P_A/0.2}\\y_A=\frac{1}{6}\\y_A=0.1667}

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3 years ago
Which of the temperatures below is most likely to be the boiling point of water at 880 torr?view available hint(s)which of the t
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Above boiling point point, liquid get converted into vapour.

Now, boiling point of water is 100 oC at room pressure. Room pressure is equal to 760 torr. Thus, at 100 oC, vapour pressure of water becomes equal to 760 torr.

Now, if external pressure is increased to 880 torr, more heat is to be supplied so that vapour pressure of water equals 880 torr.

So, at 880 torr, boiling point of water will be more than 100 oC. In present case, most like the boiling point of water is equal to 105 oC.


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The elements in which electrons are progressively filled in 4f-orbital are called.
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There are 15 metallic chemical elements called lanthanoids.

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Lanthanoids belong to f-block elements because of the filling of the 4f-orbitals.

One of the lanthanoids, lutetium (chemical symbol Lu) has 14 electrons if 4f orbitals.

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