Answer:
Rust, iron oxide, is weak mechanically although its chemical bonds are strong.
Explanation:
I think the answer is it turnes into a gas. Hope it helps! :) Asnwer is density.
20 kg = 20000 g
Option d
1 kg = 1000 g
20 kg . 1000 = 20000 g
a. O+ 2=O2
b. C2+h2=CH4
c. C2+H6= C2H6
500g