01. 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

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.