Determine the enthalpy of reaction for: 2 N2(g) + 5 O2(g) à 2 N2O5(g) ΔH°rxn = ? Given the following equations:

2H2(g) + O2(g) à 2 H2O(l) ΔH°rxn = –571.6 kJ
N2O5(g) + H2O(l) à 2 HNO3(l) ΔH°rxn = –73.7 Kj
N2(g) + 3 O2(g) + H2(g) à 2 HNO3(l) ΔH°rxn = –348.2 kJ

Seltzer water is created by placing water under pressure with carbon dioxide gas. which of the following statements best describe seltzer water: a. the solution will be slightly acidic b. the solution will be slightly basic. the solution will be strongly acidic. d. the solution will be strongly basic. e. the solution will be neutral

Which fact represents evidence for the big bang theory?

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients