The decomposition of sodium azide, NaN3(s), is used to inflate airbags. On impact, the NaN3 (s) is ignited by an electrical spark, producing N2(g) and Na(s). The N2(g) inflates
the airbag. What is the total number of moles present in a 52.0-gram sample of NaN3
(s)? (Should be 1 decimal place)

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate