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xxMikexx [17]
3 years ago
8

15. List the substances A-E in order from most dense to least dense based on the facts provided.

Chemistry
1 answer:
Volgvan3 years ago
3 0

Answer:

So 1st it is B then D then E then a then C

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Ethanol (C2H5OH) melts at –114 °C and boils at 78 °C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vapo
alexandr1967 [171]

Answer:

First question

       Q =  36826 \  J

Second  question  

       Q =  52299.7  \  J

Explanation:

From the question we are told that

     The melting point of Ethanol is  T_m  =  -114 ^oC

      The boiling point of Ethanol is  T_b   =  78^ oC

       The enthalpy of fusion of Ethanol is F  =  5.02 \  kJ / mol = 5.02 *10^{3}\  kJ / mol

        The enthalpy of vaporization  of Ethanol is L  =  38.56  \  kJ / mol = 38.56 *10^{3} \  J / mol

         The specific heat of solid Ethanol is  c_e = 0.97 \  J/ g \cdot K

          The specific heat of liquid  Ethanol is c_l  =  2.3 \  J / g \cdot K

           The mass of the Ethanol given is  m =  35.0 \ g

Considering the first question

           The initial  temperature is T_i  =  27^oC

             The final  temperature is  T_f  =  120^oC

Generally the heat required too raise the Ethanol to its boiling point is mathematically represented as

       Q_1 =  m  *  c_l *  (T_b - T_i)

=>      Q_1  =  35.0   *  2.3  *  (  78 - 27)

=>      Q_1  =4106 \ J

Genially the number of moles of Ethanol given is mathematically represented as

         n  = \frac{m}{Z}

Here Z  is the molar mass of Ethanol  with value  Z =  46 g/mol

So

         n  = \frac{35}{46 }

=>      n  = 0.7609 \  mol

Generally the heat of vaporization of the Ethanol is mathematically represented as

         Q_2 = n  * L

=>        Q_2  =0.7809   *  38.56  * 10^{3}

=>        Q_2  =29339  \  J

Generally the heat required too raise the Ethanol from  its boiling point to  T_f  is  mathematically represented as

       Q_3 =  m  *  c_l *  (T_f - T_b)

=>     Q_3 =  35   *   2.3 *  (120 - 78 )

=>     Q_3 = 3381 \  J

Generally the total heat required is  

     Q =  Q_1 + Q_2 + Q_3

=>   Q =  4106    + 29339   + 3381

=>   Q =  36826 \  J

Considering the second question

           The initial  temperature is T_i  =  -120^oC

             The final  temperature is  T_f  =  120^oC

Generally the heat required too raise the Ethanol to its melting  point is mathematically represented as

       Q_1 =  m  *  c_e *  (T_m - T_i)

=>      Q_1  =  35.0   *  0.97  *  ( -114 - (- 120) )

=>      Q_1  = 203.7 \ J

Generally the heat of fusion  of the Ethanol is mathematically represented as

                 Q_2 = n  * F

=>        Q_2  =0.7809   *  5.02 *10^{3}

=>        Q_2  =3920  \  J

Generally the heat required too raise the Ethanol to its boiling point is mathematically represented as

       Q_3 =  m  *  c_l *  (T_b - T_m)

=>      Q_3  =  35.0   *  2.3  *  ( 78 - (- 114) )

=>      Q_3  =15456  \ J

Generally the heat of vaporization of the Ethanol is mathematically represented as

         Q_4 = n  * L

=>        Q_4  =0.7809   *  38.56  * 10^{3}

=>        Q_4  =29339  \  J

Generally the heat required too raise the Ethanol from  its boiling point to  T_f  is  mathematically represented as

       Q_5 =  m  *  c_l *  (T_f - T_b)

=>     Q_5 =  35   *   2.3 *  (120 - 78 )

=>     Q_5 = 3381 \  J

Generally the total heat required is  

     Q =  Q_1 + Q_2 + Q_3+Q_4 + Q_5

=>   Q =  203.7    + 3920   + 15456 +29339+3381

=>   Q =  52299.7  \  J

5 0
2 years ago
14. Why does a sea breeze blow from the ocean toward the shore?
shepuryov [24]
A. The breeze blow from higher pressure over the water to the lower
4 0
3 years ago
Can someone please help me with this?
Sergio039 [100]
Amu valie on the top and abundsnce percent in decimals on the bottom for each isotope

7 0
3 years ago
Determine how many liters of hydrogen adjusted to STP there are in a 50.0 liter steel cylinder if the pressure inside is 100.0 a
Dvinal [7]

Answer : The volume of hydrogen gas at STP is 4550 L.

Explanation :

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas = 100.0 atm

P_2 = final pressure of gas at STP = 1 atm

V_1 = initial volume of gas = 50.0 L

V_2 = final volume of gas at STP = ?

T_1 = initial temperature of gas = 27.0^oC=273+27.0=300K

T_2 = final temperature of gas at STP = 0^oC=273+0=273K

Now put all the given values in the above equation, we get:

\frac{100.0atm\times 50.0L}{300K}=\frac{1atm\times V_2}{273K}

V_2=4550L

Therefore, the volume of hydrogen gas at STP is 4550 L.

3 0
3 years ago
A substance that prevents the flow of electric current is a(n) .
nasty-shy [4]
An Insulator.

Insulators prevent flow of electric current. Example is wood, clay.
4 0
3 years ago
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