The calculation of the energy released in the freezing of iron has been denoted as constant [tex]-\Delta H_{fus}[/tex]. Thus, option C is correct.
The heat has been the energy that has been absorbed or released by the molecules in the change in state.
The amount of heat required to freeze 1 gram of the sample at constant temperature has been termed as Heat of fusion.
The release of the energy by the system has been denoted with the negative sign, while the gain in energy has been denoted by the positive sign.
Thus, the constant used for scientist for the calculation of the heat released in melting has been [tex]-\Delta H_{fus}[/tex]. Thus, option C is correct.
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