The answer is dissolved in water, because in chemistry, (aq) is shorthand for aqueous solution.

Actually Welcome to the concept of Ions .
If we see the reaction.
H2SO4 ==> 2H+ + (SO4)2-
Here you can see, H+ ( Hydrogen ions) and (SO4) 2- ( sulphate ions) are the ions when the H2SO4 is dissolved in water.
At the end of 24 days, there will only be 16 g.
2 moles
Explanation:
Given parameters:
Mass of Sb = 243.52g
Unknown:
Number of moles = ?
Solution:
The number of moles of any substance can be calculated using the expression below:
Number of moles = 
Molar mass of Sb = 121.76g/mol
Now input the parameters:
Number of moles =
= 2 moles
learn more:
Number of moles brainly.com/question/1841136
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