How many grams of potassium are in 12.5 g potassium dichromate?

Answer 1

potassium dichromate- K2Cr2O7 12.5 grams K2Cr2O7 *(1 mol K2Cr2O7/294 grams K2Cr2O7)= .0425 mols K2Cr2O7

There's two mols of K (potassium) for every 1 mol of K2Cr2O7 (Potassium Dichromate) so you multiply the K2Cr2O7 by two to get mols of K

.0425 mols K2Cr2O7*(2 mols K/1 mol K2Cr2O7)=.085 mols K

Multiply by the molar mass of K to get grams

.85 mols K*(39 grams/1 mol K)= 3.32 grams potassium

Answer 2

12.5 g of K2Cr2O7 contain 4,42 g chromium.

Answer 3

1,2 kg of potassium dichromate are equivalent to 4,079 moles.