Earth's atmosphere contains many volatile substances that are present in trace amounts. The following quantities of these trace gases were found in a 1.0 gallon sample of air. Calculate number of moles of each gas in the sample:
a) 20.32 x 10^16 molecules of methane (g)
b) 0.0234 x 10^17 atoms of Xe (g)
c) 9.45 x 10^15 molecules of O3 (g)
d) 1.85 x 10^13 molecules of NO2 (g)