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.
So you have to multiply 786,3 times 0.98 to get the mass the mass is 770.57 if u round its 770.6 or 771
Answer:
solids
Explanation:
through solids because the molecules are closer together
Iron is left in the filter and salt solution (salt and water) passes into the cup.
Hope it helps