Which material would be totally involatile?

#"i. camphor;"#
#"ii. graphite;"#
#"iii. ammonium chloride;"#
#"iv. iodine?"#

1 Answer
Apr 12, 2017

Answer:

#"Graphite is the only contender.........."#

Explanation:

Graphite is the only material that is NON-MOLECULAR; camphor, and iodine are molecular. Ammonium chloride is a salt, that could be decomposed with heating to give #NH_3(g)# and #HCl(g)#, but this would recombine as the salt on cooling.

On the other hand, graphite is composed of an infinite array of carbon-carbon bonds in two dimensions, and as a result has highly elevated melting and boiling points. Graphite is thus non-volatile, and non-sublimable.