Nho mo nguoi giup em may bai sau.[r]
(1)Nho mo nguoi giup em may bai sau Cau 1: dung dich chua x mol Na2CO3va y molNaHCO3 voi x:y= 1:2.dung dich chua z mol HCl.thuc hien thi nghiem sau: -cho tu tu den het dung dich X vao dung dich Ythay thoat 16,8 l CO2(dktc) -cho tu tu den het dung dich Yvao dung dich Ythoat 5,7 l CO2(dktc) Tong gia tri (x+y) la : A.2 B.2,5 C 1,75 D.2,25 Cau 2: dun m g hon hop chua etyl isobutirat, axit 2-metyl propanoic, metyl butanoat can 120 g dd NaOH 6,0% va KOH 11,2 %.Co Can can than dd sau phan ung thu duoc a ghon hop hoi cac chat.Dot chay hoan toan a g hon hop hoi thu duoc 114,84 g H2O.Gia tricua m la: A.43,12 B.44,24 C.42,56 D.41,72 CAu 3: Hoa tan 22,02 gam hon hop X chua muoi sunfua va cacbua cua nhom co ti le mol tuong ung la 7:8 vao nuoc du thu duo chon hop khi.dot chay hoan toan luong naybang oxi vua du,ngung tu san pham chay thu duo chon hop Y.suc y vao 200ml KOH a M va Ba(OH)2 1M thu duoc 30,95 g ket tua Gia tri cua A la: A.1,25M B.0,75M C.1,00M D.0,05 (2)