Δh o f of hydrogen chloride [hcl(g)] is −92.3 kj/mol. given the following data, determine the identity of the two missing products and calculate the δh o rxn for equation 3. [hint: start by writing the chemical equation that corresponds to δh o f for hcl(g).] n2(g) + 4h2(g) + cl2(g) → 2nh4cl(s) δh o rxn = −630.78 kj/mol (1) n2(g) + 3h2(g) → 2nh3(g) δh o rxn = −296.4 kj/mol (2)

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.