One mole of gas obey the equation of state P(V - b) = RT and changes its coordinate from (P_1, V_1) to (P_2, V_2) which is established on P-V diagram by line. The work done in this changes will be_____

One mole of gas obey the equation of state P(V - b) = RT and changes i

1.	One mole of gas obey the equation of state P(V - b) = RT and changes its coordinate from (P_1, V_1) to (P_2, V_2) which is established on P-V diagram by line. The work done in this changes will be_____
Answer» `1/2(P_2-P_1)(V_2+V_1+2b)` `1/2(P_1+P_2)(V_2-V_1)` `1/2(P_2-P_1)(V_2-V_1)` `1/2(P_1+P_2)(V_2-V_1+2b)` SOLUTION :WORK DONE by expansion from `(P_1,V_1)` to `(P_2,V_2)` W= Area under the graph of `P to V` `W=1/2` base x height +Area of rectangular `=1/2(V_2-V_1)xx(P_1-P_2)+(V_2-V_1)P_2` `=(V_2-V_1)[P_1/2-P_2/2+P_2]` `=(V_2-V_1)[P_1/2+P_2/2]` `=1/2(P_1+P_2)(V_2-V_1)`