3. Given the following information, calculate Delta Hrxn for the overall equation: 2NO2(g) + 1/2O2(g) → N2O5(5)
N2O5(s) + 2NO(g) + 3/2 O2(e); deltaH=223.7 kJ/mol
NO(g) + 1/2O2(g) → NO2(g) ; deltaH=-55.1kj/mol
AH = 223.7 kJ/mol
AH = - 55.1 kJ/mol

C) electrons encircling a nucleus with neutrons and protons

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.