Question

What mass is associated with a `2*mol` quantity of potassium dichromate?

Answer 1

Potassium dichromate has a molar mass of `294.18*g*mol^-1`.

Explanation:

And we got a 2 mole quantity, so we take the product.....

`2*cancel(mol)xx294.18*g*cancel(mol^-1)~=588*g`......

Answer 2

`592g`

Explanation:

When you talk about gram atoms, I think you're speaking about Molar Mass, like gramspermole `(gmol^-1)`

Moles doesn't affect the value of Molar mass of a compound, hence it's just a term that wants to drive you far away from the answer..

`"Formula" = K_2Cr_2O_7` that's your equation right?

`Cr = 52`

`K = 40`

`O = 16`

Hence...

`"Molar Mass" = K_2Cr_2O_7gmol^-1`

`"Molar Mass" = (40 xx 2) + (52 xx 2) + (16 xx 7) gmol^-1`

`"Molar Mass" = (80 + 104 + 112) gmol^-1`

`"Molar Mass" = 296gmol^-1`

Hence `2` moles of it will give..

`rArr 2mols xx 296gmol^-1`

`rArr 2cancel(mols) xx 296g cancel(mol^-1)`

`rArr 2xx 296g`

`rArr 592g`

Hope this helps!