Khi tiến hành phân tích định lượng của một công thức đường thấy % C bằng 42.11% %của H là 6.43%,% của oxi là 51.46 % .Hãy tìm công thức đúng. Biết m hợp chất nhỏ hơn 356 đvc

2 câu trả lời

Đáp án: gọi ct ttongr quát là CxHyOz

%C=42,11 ---> $\frac{12x}{12x+y16z}$ =0,4211

%H=6,43 ------> $\frac{y}{12x+y+16z}$ = 0,0643

12x+ y +16z< 356

Giả sử 12x +y + 16z =356

----> x=12,49 y=22,89 z=11,44

-----> Ct của Hợp Chất là C12H22O11

Giải thích các bước giải:

Đáp án:

Giải thích các bước giải:

Gọi công thức đơn giản nhất là CxHyOz

$x:y:z = {{42,11} \over {12}}:{{6,43} \over 1}:{{51,46} \over {16}} = 12:22:11$

→ CTĐGN: C12H22O11

→ CTPT: (C12H22O11)n

PTK: 342.n<356

→n<1,04

→ n= 1

CTPT: C12H22O11

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