Final answer:
Using the concept of specific heat capacity, if 25 kJ is required to raise a rock's temperature by 5°C from 25°C to 30°C, the same amount of heat, 25 kJ, is necessary to raise the temperature from 45°C to 50°C, assuming a constant heat capacity.
Step-by-step explanation:
The question involves the concept of specific heat capacity in chemistry, which is the amount of heat needed to raise the temperature of a substance by a certain temperature interval. The given problem states that 25 kJ is necessary to raise the temperature of a rock from 25°C to 30°C and asks how much heat is necessary to heat the rock from 45°C to 50°C.
If the rock's specific heat capacity remains consistent, then the heat required to increase the temperature by the same amount (5°C) should also be the same, provided there are no phase changes or other conditions that affect heat capacity. In this case, the amount of heat necessary would be the same 25 kJ to raise the temperature from 45°C to 50°C as it was to raise it from 25°C to 30°C.
This is because the problem implies that the heat capacity is constant over this temperature range, and the heat transferred depends directly on the temperature change (which is identical for both cases: 5°C).