Bai1 De trung hoa m gam hon hop X gom hai axit no don chuc mach ho ke tiep nhau trong day dong dang can 100ml dung dich NaOH 0,3M .Mat khac dem dot chay m gam hon hop X roi cho san pham [r]
Trang 1Bai1 De trung hoa m gam hon hop X gom hai axit no don chuc mach ho ke tiep nhau trong day dong dang can 100ml dung dich NaOH 0,3M Mat khac dem dot chay m gam hon hop X roi cho san pham chay lan luot di qua binh 1 dung P2O5 binh 2 dung KOH
du thay khoi luong binh 1 tang a gam binh 2 tang (3,64+a) gam.Thanh phan phan tram khoi luong axit co so nguyen tu cacbon nho trong hon hop X la
Bai2 Dot hoan toan hon hop X gom nhung luong bang nhau ve so mol cua FeS2 va Cu2S thu duoc 3,36 lit SO2 (dktc) va chat ran Y gom FeS2 va Cu2O hap thu het SO2 thu duoc bang dd nuoc Br2 vua du thu duoc dd Z co nong do loang cho toan bo Y vao Z sau khi cac pu say ra hoan toan thi so gam chat ran con lai khong tan la
Bai3Cho hon hop X gom Fe va Cu vao 400ml dd chua hon hop gom H2SO4 0,5M va NaNO3 0,2M sau khi cac pu xay ra hoan toan thu duoc dd Y va khi NO (sp khu duy nhat) dong thoi con 1 kim loai chua tan Cho Vml ddNaOH vao dd X thi luong ket tua la lon nhat Gia tri toi thieu cua Vml la
Bai4Mach RLC noi tiep gom cuon day(L r) va tu dien C Dat vao hai dau doan mach mot hieu dien the u=căn2cos(100pi t).Dieu chinh C dr Uc=Ucmax=50V.Hieu dien the hieu dung giua 2 dau cuon day khi do la
Em dang on de chuan bi thi thu em mong anh co gang giai giup em voi Em xin cam on truoc nhe!