Final answer:
The question requires the latent heat of fusion of copper to calculate the calories needed to melt 30 grams of copper; however, this value is not provided in the information given, thus making it impossible to determine the exact number of calories with the given data.
This correct answer is none of the above.
Step-by-step explanation:
To calculate the number of calories needed to melt 30 grams of copper, one would need to know the specific heat of copper and its melting point.
However, the specific heat given (c = 0.0923 cal/g °C) pertains to the heat required to change the temperature of copper, not to melt it.
The melting of a substance involves a phase change and requires knowledge of the latent heat of fusion, which for copper is not given in the information provided.
Therefore, with the information provided, it is not possible to calculate the precise number of calories needed to melt 30 grams of copper.
This correct answer is none of the above.