Calculate the percentage composition of chromium in potassium dichromate, K2Cr2O7.
K=39,Cr=52,O=16
how many moles are there in 49.0g of potassium dichromate, K2Cr2O7 ? (atomic masses: K = 39, Cr = 52, O = 16 )
Calculate the percentage composition of chromium in potassium dichromate?