Ung voi khoi luong muoi do thì can bao nhieu mol NaCl de tra loi cau hoi nay chung ta can biet den cong thuc nao. Hay giai thich cac dai luong trong cong thuc do va khai trien cong thuc do co tinh tuong duong. Nhom ban co "tips" nao de giup cac ban trong lop de nho cong thuc hay khong (cang nhieu "tips" cang tot)
hop chat Xla mot loai phan bon hoa hoc ,duoc dung kha pho bien trong san xuat nong nghiep.Cong thuc hoa hoc cua X co dang KxSyOz. Thanh phan phan tram theo khoi luong cua cac nguyen to trong X nhu sau :44,83%K ;18,39%S va 36,78%O. Xac dinh cong thuc hoa hoc cua X, biet khoi luong mol cua X la 174g/mol
lap cong thuc hoa hoc cua oxit sat(tao boi Fe va O)trong do Fe chiem 70% ve khoi luong.Cho khoi luong mol pham tu cua oxit tren la 160/mol
viet cong thuc thuc tinh thanh phan phan tram theokhoi luong cua 1 nguyen to trong hop chat khi biet cong thuc hoa hoc cua hop chat
xac dinh cong thuc hoa hoc cua Y biet khoi luong mol cua Y la 85 g/mol
Mot loai dong oxit 1 mau den co khoi luong mol p/tu la 80g. Oxit nay co thanh phan la 80% dong va 20% oxi. Tim c/thuc hoa hoc cua loai dong oxit tren .
Hay thiet lap bieu thuc tinh so mol chat theo :a so nguyen tu hoac so phan tu cua chat
B khoi luong chat
C the tich doi voi chat khi
Hop chat A co so mol =142 . Na=32,39% ; S = 22,54% ,con lai la Oxi . Xac dinh cong thuc hpa hoc A
hoa tan 16g oxit cua kim loai A hoa tri khong doi can dung 109,5g dung dich hcl 20% .xac dinh cong thuc cua oxit
1 hop chat co %AI=53%; %0=47% klg mol hop chat la 1029/mol. Xac dinh cong thuc hoa hoc cua hop chat