text: # Heat of Displacement
  
  Heat of displacement is the energy change when one mole of metal is displaced from its salt solution by a more electropositive metal
  1. Displacement reaction occurs when a metal which is situated at a higher position in the electrochemical series displace a metal below it from its salt solution.
  2. The heat of displacement is the energy change when one mole of metal is displaced from its salt solution by a more electropositive metal
  3. Displacement reaction is always an exothermic reaction.
  4. The example below shows how the heat of displacement can be calculated.
  
  Example:
  
  A student pours 50cm³ hydrochloric acid, 2 mol/dm³ into a plastic beaker, and records its temperature. Some zinc powder (excess) is added into the acid. The solution is stirred by using a glass rod, and the highest temperature that reaches by the mixture is recorded.
  Initial temperature of the solution: 27.0°C
  Highest temperature of the solution: 57.0°C
  Find the heat of displacement of the reaction.
  [Specific heat capacity of the solution = = 4.2 Jg-1°C-1, density of the solution =1 g/cm³ ]
  
  2HCl(ak) + Zn(p) → ZnCl2 (ak) + H2(g)
  
  Number of mole of hydrochloric acid
  \begin{gathered}
  n = \frac{{MV}}{{1000}} \hfill \\
  n = \frac{{(2.0)(50)}}{{1000}} \hfill \\
  n = 0.1mol \hfill \\
  \end{gathered}
  
  Number of mole of hydrogen gas produced
  = 0.1/2=0.05mol
  
  Amount of heat released
  
  Q = mcθ
  Q = (50)(4.2)(57-27)
  Q = 6300J
  
  $\begin{gathered} \Delta H = \frac{{{\text{Heat Change}}}}{{{\text{Number of mole of precipitate form}}}} \hfill \\ = \frac{{6300}}{{0.05}} \hfill \\ = 126,000Jmo{l^{ – 1}} = 126kJmo{l^{ – 1}} \hfill \\ \end{gathered}$
  
  1. hi
explanation: The document provides a detailed explanation of the concept of heat of displacement, including the definition, conditions for displacement reactions, and an example problem. The example problem includes a step-by-step calculation to find the heat of displacement of a reaction between hydrochloric acid and zinc powder. The document also contains the solution to the problem.
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distilabel_metadata.content: # Heat of Displacement
  
  Heat of displacement is the energy change when one mole of metal is displaced from its salt solution by a more electropositive metal
  1. Displacement reaction occurs when a metal which is situated at a higher position in the electrochemical series displace a metal below it from its salt solution.
  2. The heat of displacement is the energy change when one mole of metal is displaced from its salt solution by a more electropositive metal
  3. Displacement reaction is always an exothermic reaction.
  4. The example below shows how the heat of displacement can be calculated.
  
  Example:
  
  A student pours 50cm³ hydrochloric acid, 2 mol/dm³ into a plastic beaker, and records its temperature. Some zinc powder (excess) is added into the acid. The solution is stirred by using a glass rod, and the highest temperature that reaches by the mixture is recorded.
  Initial temperature of the solution: 27.0°C
  Highest temperature of the solution: 57.0°C
  Find the heat of displacement of the reaction.
  [Specific heat capacity of the solution = = 4.2 Jg-1°C-1, density of the solution =1 g/cm³ ]
  
  2HCl(ak) + Zn(p) → ZnCl2 (ak) + H2(g)
  
  Number of mole of hydrochloric acid
  \begin{gathered}
  n = \frac{{MV}}{{1000}} \hfill \\
  n = \frac{{(2.0)(50)}}{{1000}} \hfill \\
  n = 0.1mol \hfill \\
  \end{gathered}
  
  Number of mole of hydrogen gas produced
  = 0.1/2=0.05mol
  
  Amount of heat released
  
  Q = mcθ
  Q = (50)(4.2)(57-27)
  Q = 6300J
  
  $\begin{gathered} \Delta H = \frac{{{\text{Heat Change}}}}{{{\text{Number of mole of precipitate form}}}} \hfill \\ = \frac{{6300}}{{0.05}} \hfill \\ = 126,000Jmo{l^{ – 1}} = 126kJmo{l^{ – 1}} \hfill \\ \end{gathered}$
  
  1. hi
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distilabel_metadata.raw_output_q_a_detector_0: The document provides a detailed explanation of the concept of heat of displacement, including the definition, conditions for displacement reactions, and an example problem. The example problem includes a step-by-step calculation to find the heat of displacement of a reaction between hydrochloric acid and zinc powder. The document also contains the solution to the problem.
  
  Label: question-and-answer