Kimia Anorganik 2 Dalam Blogku

1. Kubus Sederhana

r = jari-jari atom
a = 2 r^3
volume kubus

= a^3
= (2 r )^3
= 8 r^3
volume atom
= 4/3 . 3,14 . r^3
= 4,19 r^3

volume rongga

= 8 r^3 – 4,19 r^3
= 3,81 r^3

% rongga

= (3,81 r^3 : 8 r ^3) x 100%
= 47,66 %

2. Kubus Berpusat Badan

(4 r)^2 = 3 a^2

a^3 = 12,31 r^3

volume rongga = volume kubus - volume atom

= a^3 - 2 . (4/3 . 3,14 . r^3)

= 12,31 r^3 - 8,37 r^3

= 3,94 r^3

% rongga = (3,94 r^3 : 12,31 r^3) x 100%

= 32,01 %

3. Kubus Pusat Muka

(4 r)^2 = 2 a^2

volume rongga = volume kubus - volume atom

= a^3 - 4 (4/3 . 3,14 . r^3)

= 22,63 r^3 - 16,75 r^3

= 5,88 r^3

% rongga = (5,88 r^3 : 22,63 r^3) x 100%

= 25,97 %