A. <span>The amplitude doubled hope this helps and have a nice day</span>
Answer:
The concentration is 
Explanation:
From the question we are told that
The absorbance is 
The length is 
Generally absorbance is mathematically represented as

where
is the molar absorptivity of FeSCN2 with a value 
and
is the equilibrium concentration of FeSCN2
So

substituting values


Answer:
We can't see the options so we don't know what we can put
Explanation:
yes substances Do react by mass