How much heat, in joules and in calories, must be added to a 75.0–g iron block with a specific heat of 0.449 j/g °c to increase its temperature from 25 °c to its melting temperature of 1535 °c?

Explanation:

Hello!

In this case, given the mass, temperature change and specific heat, it is possible to compute the required heat in joules as shown below:

Now, since 1 cal =4.184 J, this result in calories is:

Best regards!

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.