Final answer:
The student's question about the amount of heat needed for a thermodynamic process refers to Physics and typically requires information about the mass, initial and final states of the substance, and type of process involved. For phase changes, the heat needed is calculated using the latent heat and mass of the substance. Without specific details for process 1→2, an exact answer cannot be provided.
Step-by-step explanation:
The student's question, "How much heat is needed for process 1→2?" relates to a thermodynamic process which falls under the subject of Physics. To determine the heat needed for a specific process, we must have information about the substance involved, its mass, its initial and final states, and the type of thermodynamic process (isothermal, adiabatic, isobaric, isochoric, or phase change).
Regarding the example provided, which mentions heat absorption by melting ice, we can deduce that the process involves a phase change. To calculate the heat (Q) required for a phase change, we use the formula Q = m∙L, where m is the mass and L is the latent heat of the substance during the phase change. If the substance is ice and the phase change is melting, we would use the latent heat of fusion for ice, which is approximately 334 kJ/kg.
In the absence of specific mass and state information for process 1→2 in the student's question, we cannot provide an exact numerical answer. However, we can say that the quantity of heat needed for any phase change or temperature change depends on the mass of the substance, its specific heat capacity (if the process involves heating or cooling without a phase change), and the latent heat (if the process involves a phase change)