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# What happens to a solid whose vapour pressure reaches 760 mm Hg at temperatures which are lower than the triple point?

(a) it melts

(b) it sublimes

(c) it burns

(d) it evaporates

Can you answer this question?

Toolbox:
• Solid-Gas Equlibrium
• Only those solids sublime whose vapour pressure reaches 760 mm Hg at temperatures which are lower than their triple point and consequently these substances evaporate at 1 atmospheric pressure without even melting

answered Nov 13, 2013