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

The pressure inside a hydrogen-filled container was 2.10 atm at 21 ? c. what would the pressure be if the container was heated to 92 ? c ?

The peak wavelength for the blackbody curve of a star is in the uv range. assuming the radiation from this star can reach earth, would you be able to see it?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?