Question

Question #c3e3a

Answer 1

in oder to find the mass of one molecule of `NO_2` nitrogen dioxide, which could actually be the polyatomic ion nitrite `NO_2^-1`, we must convert one molecule to moles and than moles to grams.

molecules `->` moles `->` grams

Begin with one molecule and convert it to moles by using Avogadro's number `6.02 x 10^23`

1 molecule `NO_2` x `((1 mol)/(6.02 x 10^23))` = `1.66 x 10^-24` moles

Now convert the moles to grams by using the molar mass (gfm) of `NO_2`

N = 14.01 x 1 = 14.01 g `O_2` = 16.0 x 2 = 32.0 g
14.01 + 32.0 = 46.01 g

`1.66 x 10^-24` moles x `((46.01 g)/(1 mol))` = `7.64 x 10^-23` grams `NO_2`