Question

cho 10.2 g hon hop gom al va mg vao dung dich hcl du sau khi phan ung ket thuc thi thu duoc 11.2 lit khi (đktc)

Answer 1

PTHH

Al + 6HCl -> 2AlCl₃ + 3H₂

Mg + 2HCl -> MgCl₂ + H₂

n_H2 = 11.2/22.4 = 0.5 mol

gọi nAl = x mol ; nMg = y mol

ta có 27x + 24y = 10.2

3x+ y = 0.5

-> x = 0.04 ; y = 0.38

mAl = 0.04.27 =1.08 (g)

%mAl = (1.08/10.2).100%=10.6%

%mMg = 100% - 10.6% = 89.4%

Answer 2

Thiếu :Hãy tính tp %theo kl cua mõi kim loai (.) hh