Calculate ΔH for 2NO (g) + O2 (g) → N2O4(g) using the following information N2O4 (g)→ 2NO2 (g) ΔH = 57.9 KJ ,
2NO (g)+O2(g) → 2NO2 (g) ΔH= -113.1 KJ
a) 2.7KJ b) -55.2KJ c) -85.5 KJ d)-171.0 KJ e) +55.2KJ
Is the answer d?

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.

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

Explain what happens at the saturation point when adding salt to water at room temperature.