Question

[Ten la Gi]

Cau 5: Nguyen tu kem co ban kinh r = 1, 35. 10^-1 nm va co khoi luong nguyen tu la 65 u

A) Tinh khoi luong rieng cua nguyen tu kem

B) Thuc te hau nhu toan bo khoi luong nguyen tu tap trung o hat nhan voi ban kinh r = 2. 10^-6 nm. thing khoi luong rien cua hat nhan nguyen tu kem.

Cho biet V_{hinh cau} = \(\dfrac{4}{3}\pi\) r³

Answer 1

[Đào Ngọc Hoa]

a. Ta có: \(V=\dfrac{4}{3}.\pi.\left(1,35.10^{-1}.10^{-9}\right)^3=10,306.10^{-30}\left(m^3\right)\)

\(m=65.1,6605.10^{-27}=107,9325.10^{-27}\left(kg\right)\)

\(\Rightarrow D=\dfrac{m}{V}=\dfrac{107,9325.10^{-27}}{10,306.10^{-30}}=10,47.10^3\left(kg\m^3 \right)\)

b. Ta có: \(V=\dfrac{4}{3}.\pi.\left(2.10^{-6}.10^{-9}\right)^3=33,51.10^{-45}\left(m^3\right)\)

\(\Rightarrow D=\dfrac{107,9325.10^{-27}}{33,51.10^{-45}}=3,22.10^{18}\left(kg\m^3 \right)\)