Final answer:
To calculate the heat required to raise the temperature of a substance, we need its specific heat, which is not given in the question.
Step-by-step explanation:
To calculate the amount of heat required to raise the temperature of a substance, we can use the formula heat = mcΔT, where m is the mass of the substance, c is its specific heat, and ΔT is the change in temperature. In this case, the mass of the iron is given as 1.25 kg. The specific heat of iron, which represents the amount of heat required to raise the temperature of 1 gram of iron by 1 degree Celsius, is not provided in the question. Therefore, we cannot determine the specific heat of iron based on the given information.