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

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Answer 1 · 2017-09-20T06:31:14

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

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 · 2017-09-20T06:36:28

#592g#

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!