a, nA = \(\dfrac{so_{ }nguyen_{ }tu_{ }A\left(so_{ }phan_{ }tu_{ }A\right)}{6.10^{23}}\)
b, nA = mA : MA
c, nA = \(\dfrac{V_A}{22,4}\) (đktc)
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
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
Cac buoc xac dinh thanh phan phan tram theo khoi lg cua cac ng to trong hop chat khi biet c/thuc hoa hoc cua hop chat.
Xax dinh c/thuc hoa hoc cua hop chat khi biet thanh phan phan tram .
khu hoan toan 5.43g hon hop gom dong oxit va chi oxitva bang khi hidro thu dc 0.9g h2o
a tinh thanh phan phan tram theo khoi luong cac oxit trong hon hop ban dau .
b tinh thanh phan phan tram khoi luong cua cac chat ran thu dc sau pha ung
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
1 hop chat co %AI=53%; %0=47% klg mol hop chat la 1029/mol. Xac dinh cong thuc hoa hoc cua hop chat
Hop chat A co so mol =142 . Na=32,39% ; S = 22,54% ,con lai la Oxi . Xac dinh cong thuc hpa hoc A
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 sap xep theo chieu tang dan so ntu O2 co trong k/l moi chat sau;CACO3,MGCO3,FE2O3