For the following processes at 1 atm, please give the signs of ΔH, ΔS, and ΔG. Please briefly give the steps on how you

[answerhappygod]

For the following processes at 1 atm, please give the signs
of ΔH, ΔS, and ΔG.
Please briefly give the steps on how you
derive your answers.
(a) substance A melts at –50 °C.
(b) substance A melts at –70 °C.
(c) substance A melts at –90
°C.
[substance A’s normal melting point is –70 °C]