Final answer:
The equivalent mass of HCl in a redox reaction depends on its role as a reducing agent, requiring more information from the student to provide a precise answer.
Step-by-step explanation:
The student has asked about the equivalent mass of HCl in a specific redox reaction involving potassium dichromate (K₂Cr₂O₇) and hydrochloric acid (HCl). In the provided reaction, HCl is acting as a reducing agent, and the equivalent mass of HCl can be determined based on the number of moles of electrons that one mole of HCl can supply. In the relevant half-reaction, HCl provides electrons to facilitate the reduction of CrO₇²- ions to Cr³+ ions:
Cr₂O₇²- (aq) + 14H+ (aq) + 6e⁻ → 2Cr³+ (aq) + 7H₂O(l)
However, the reaction provided in the student's question is incomplete and does not align with standard redox reactions in chemistry texts. Thus more context or clarification from the student would be required to give a precise answer regarding HCl's equivalent mass in that particular reaction.