Final answer:
The question seems to have been misclassified and should be under Mathematics for permutations and combinations, but instead includes Chemistry detail on equilibrium that does not match the initial query. In Chemistry, the partial pressures of gases at equilibrium can be calculated using the equilibrium constant, but the provided information is insufficient to solve without more context or the stoichiometry of the reaction.
Step-by-step explanation:
The subject of this question is Chemistry, specifically involving the calculations related to chemical equilibrium and the conversion of equilibrium constants (Kc to Kp and vice versa). Unfortunately, the provided details do not directly relate to the initial student's assignment of calculating the value of 5P₃ + 25 * 6C₂, which seems to involve permutations and combinations, categorizing it under Mathematics rather than Chemistry.
However, for the Chemistry topic that was provided, we consider the reaction equation A(s) + B(g) = C(s) + D(g), with Kp = 157.2 at 25°C. If the total pressure of the system is 4.3 atm, the partial pressures of B(g) and D(g) need to be determined based on equilibrium conditions and the given equilibrium constant (Kp). The relationship between Kc and Kp can be described using the equation Kp = Kc(RT)Δn, where Δn is the change in moles of gas in the reaction, R is the gas constant, and T is the temperature in Kelvin. However, without the stoichiometry or initial concentrations, this question cannot be answered.