The following substances are present in different containers
(i) One gram atom of nitrogen
(ii) One mole of calcium
(iii) One atom of silver
(iv) One mole of oxygen molecules
(v) 1023 atoms of carbon and
(vi) One gram of iron.
The correct order of increasing masses (in grams) is/are

Explanation

(i) 1 mole of Ag atoms = 108 g `=6.022xx10^(23)` atoms
i.e., mass of `6.022xx10^(23)" atoms of Ag = 108 g "therefore" Mass of 1 atom of Ag"=(108)/(6.022xx10^(23))=1.793xx10^(-22)g`
(ii) Mass of one gram atom of N = At. Mass of grams = 14.0 g
(iii) Mass of one mole of Ca = At. Mass in grams = 40.0 g
(iv) Mass of one mole of oxygen molecules = Mol. mass in grams = 32.0 g
(v) 1 mole of C atoms = 12 g `=6.022xx10^(23)` atoms, i.e., Mass of `6.022xx10^(23)` atoms of C = 12.0 g
`therefore" Mass of " 10^(23)" atoms of C"=(12)/(6.022x10^(23))xx10^(23)=1.993g`
(vi) Mass of iron = 1.0 g (Given)
Thus, the order of increasing masses is : One atom of silver lt one gram of iron lt `10^(23)` atoms of carbon lt one gram-atom of nitrogen lt one mole of oxygen lt one mole of calcium.