Trong phân tử M2X có tổng số hạt là 164 trong đó số hạt mang điện nhiều hơn số hạt không mang điện là 52 số khối của M lớn hơn số khối của X là 7. Tổng số hạt trong M nhiều hơn trong X là 10. Tìm công thức phân tử của M2X

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Đáp án:

K2S

Giải thích các bước giải:

gọi số e và số p trong X là Zx,và số notron trong X là Nx

gọi số e và số p trong M là Zm,số notron trong M là Nm

ta có hệ (2Zm+Nm)+2.(2Zx+Nx)=164(1)

(2Zm+2.2Zx)-(Nm+2Nx)=52(2)

(Zm+Nm)-(Zx+Nx)=5(3)

(2Zm+Nm)-(2Zx+Nx)=8(4)

viết thì dài thật ra chỉ cần dùng cái 1 và 4,gọi (2Zm+Nm)=a,(2Zx+Nx)=b

ta có hệ a+2b=164

a-b=8

a=60,b=52,lấy Mm=60/3=20

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