Elemental tin forms two allotropes, white tin and gray tin. For the conversion of white tin to gray — Thermodynamics Chemistry Question
Question
Elemental tin forms two allotropes, white tin and gray tin. For the conversion of white tin to gray tin, ∆H° = –2.02 kJ mol-1 and ∆S° = –7.04 J mol-1 K-1. Which statement best describes the stability of the two phases?
A.
White tin is stable below 13.8 °C and gray tin is stable above this temperature.
B.✓ Correct
Gray tin is stable below 13.8 °C and white tin is stable above this temperature.
C.
White tin is stable below 0.3 °C and gray tin is stable above this temperature.
D.
Gray tin is stable below 0.3 °C and white tin is stable above this temperature.
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