Answer:
The right answer is "3 g".
Explanation:
Given:
Initial mass substance,

By using the relation between half lives and amount of substances will be:
⇒ 


Thus, the above is the correct answer.
Iron rusts when exposed to air → chemical property
Answer: S8(s) + 8O2(g) → 8SO2(g) ΔH = -2368 kJ a.