Question

The formula weight of potassium dichromate (k2cr2o7) is __________ amu.

Answer 1

The given compound is
`K_(2)Cr_(2)O_(7)`

Each formula unit of
`K_(2)Cr_(2)O_(7)` has 2 mol Potassium (K) atoms, 2 mol Chromium (Cr) atoms and 7 mol Oxygen (O) atoms.

Atomic weight of potassium is 39.0983 amu

Atomic weight of Chromium is 51.9961 amu

Atomic weight of Oxygen is 15.9994 amu.

Therefore the formula weight of
`K_(2)Cr_(2)O_(7) =`

`2 * 39.0983 amu + 2 * 51.9961 amu + 7 * 15.9994 amu`

= 294.1846 amu