From the following enthalpy changes, H2(g) + 1/2O2(g) H2O (I) AH = -285.8 kj
N2O5(g) + H2O (I) 2 HNO3 (I) AH = -76.6 kj
1/2 N2(g) + 3/2 O2(g) + 1/2 H2(g) HNO3 (I) AH = -174.1 kj
calculate the value of AH for the reaction
2 N2 (g) + 5 O2 (g)

What does the process of natural selection involve

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

An atom of lithium (li) and an atom of chlorine (cl) engage in a chemical reaction. which correctly describes the structure of the resulting chemical compound? hint: consider the class of each element. the chemical compound will have a network structure. the chemical compound will have triple bonds. the chemical compound will have a ball-and-stick structure. the chemical compound will have double bonds.