Chemical Thermodynamics Chapter 4 Chemistry Class 12 Textbook Solution

    3. Answer in brief.

    vi. Obtain the expression for work done in chemical reaction.

    Answer:-
    1. In chemical reactions, work is performed when the system is held at constant temperature and pressure. This can be described by the equation:

      2. W = -PextΔV        ....(1)

    2. If we assume that the external pressure (\(P_{\text{ext}}\)) is equal to the system pressure (\(P\)), we can simplify the equation as follows:

      3. W = -PΔV

      = -P(V2 - V1)

      W = -PV2 + PV1      .....(2)

    3. When dealing with ideal gases at constant temperature and pressure, we can use the following relationships:

      4. PV1 = n1RT

      PV2 = n2RT      ....(3)

      By substituting equation (3) into equation (2), we obtain:

      W = -n2RT + n1RT

      = -(n2 - n1)RT

      = -ΔngRT        .....(4)

    4. Equation (4) represents the work done by the system during chemical reactions.
    Q 3.5
    Q 3.6
    Q 3.7

    Chemical Thermodynamics Chapter 4 Chemistry Class 12 Textbook Solution