Final answer:
Detailed initial conditions of the refrigerant-134a are needed to answer most parts of the question, except for identifying the refrigerant type, which is already provided as refrigerant-134a.
Step-by-step explanation:
To address the student's question about a 0.5 m rigid tank containing refrigerant-134a, detailed information about the initial conditions such as temperature, pressure, or the state (liquid, vapor, or mixture) of the refrigerant would be required to answer options a), b), and d). Since it is not provided, we can't accurately determine the pressure in the tank (a), calculate the volume (b), or find the mass of the refrigerant-134a (d). However, we can answer option c) directly, as the type of refrigerant is already identified in the question as refrigerant-134a.