Without doing any detailed calculations (but using a periodic table to give atomic weights), rank the following samples in order of decreasing number...

Without doing any detailed calculations (but using a periodic table to give atomic weights), rank the following samples in order of decreasing number of atoms: 3.0 times 10^{23} molecules of rm H_2O_2, 2.0; rm mol ; rm CH_4, 32 ; rm g ; rm O_2.