The volume composition of air at sea level has been reported to be as follows: nitrogen 78.084%; oxygen 20.9476%; argon 0.934%; carbon dioxide 0.0314%; neon 0.001818%; methane 0.0002%; helium 0.000524%; krypton 0.000114%; hydrogen 0.5%; xenon 0.87%; ozone 0.7%; nitrogen dioxide 0.2%; and iodine 0.1%. , compute the molar mass of air, in [kg/mol] based on this composition.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)