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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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 The  empirical  formula    of hydrocarbon is  CH2

The  molecular formula  of the  hydrocarbon is  C6H12


    <u><em>Explanation</em></u>

Hydrocarbon  is  made up  of carbon and hydrogen


<h3><u><em> </em></u>Empirical formula  calculation</h3>

 Step 1:  find  the  moles   CO2  and  H2O

moles =mass/molar mass

moles   of CO2 =  6.59 g/ 44 g/mol = 0.15 moles

moles of H2O = 2.70 g / 18 g/mol =  0.15  moles

Step 2: Find the moles  ratio  of Co2:H2O  by diving  each mole by smallest mole(0.15)

that  is  for  CO2 = 0.15/0.15  =1

              For H2O = 0.15/0.15 =1

therefore  the mole ratio  of Co2 : H2O = 1:1  which  implies that 1 mole of Co2  and 1  mole of H2O is  formed  during combustion reaction.


From the  the law of mass conservation the number  of atoms in reactant side  must  be equal to  number of  atoms  in product side

therefore  since  there 1 atom  of C  in product side there  must be 1 atom of C  in reactant  side.

In addition  there is 2 H atom in product  side  which should be the  same  in reactant side.  

From information above the empirical formula is therefore = CH2


Molecular formula  calculation

[CH2}n= 84 g/mol

[12+ (1x2)] n = 84 g/mol

14 n =  84 g/mol

n = 6

multiply the  each subscript  in CH2  by  6

 Therefore the molecular formula = C6H12




5 0
3 years ago
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