crude calcium carbide is made in an electric furnace where product contain 85% of Cac2 and 15% of unreacted so how much so is to be added for each 1000kg of Crude to production how much so is to be added 4000 kg of crude production

After comparing molecular and atomic masses we find that 56 g of CaO is needed to produce 64 grams of pure CaC2, 56gm---------64gmXgm-----------1000gmtherefore 1000 kg pure CaC2 requires (1000*56)/64 kg of CaO.Hence,1000 kg crude product requires, (((850*56)/64) +150) kg of CaOHope it helps