How many grams of `KClO_(4)` contain `40gm 'O'` .

How many gram of KMnO_(4) are contained in 4 litre of 0.05 N solution . The KMmO_(4) is to be used as an oxidant in acidic medium ?

How many grams of CaWO_4 would contain the same mass of tungsten that is present in 569 g of FeWO_4 ? (W = 184)

An impure sample ( having 60 % purity ) of KClO_(3) contains 30 gm of pure KClO_(3) .Find weight of impure sample.

How many grams of oxygen gas contain the same number of molecules as 16 grams of sulphur dioxide gas ? (O = 16 u , S = 32 u)