nO2=0,075(mol)nO2=0,075(mol) mO2=2,4(g)mO2=2,4(g) Theo ĐLBTKL => mB=15,15−2,4=12,75(g)mB=15,15−2,4=12,75(g) mO=4,8(g)mO=4,8(g) mN=2,1(g)mN=2,1(g) mK=5,85(g)mK=5,85(g) x:y:z=4,816:2,114:5,8539=1:1:2x:y:z=4,816:2,114:5,8539=1:1:2 => CTHH: KNO2KNO2 *)Bảo toàn nguyên tố O: mO2=7,2(g)mO2=7,2(g)...