Ahelium-filled weather balloon has a volume of 793 l at 16.9°c and 759 mmhg. it is released and rises to an altitude of 4.05 km, where the pressure is 537 mmhg and the temperature is –7.1°c.

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)