Answer:
D.
The concentration of reactants and the concentration of products are constant.
Explanation:
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The new volume of the hydrogen gas in the balloon is 1.5 L.
<u>Explanation:</u>
At STP, Temperature, T1 is 0° C = 0 + 273 K = 273 K
Pressure, P1 = 1 atm
Here given volume, V1 = 3.60 L
Balloon at sea,
Pressure, P2 = 2.5 atm
Temperature, T2 = 10° C = 10 + 273 = 283 K
Volume, V2 = ?
Here, we have to use the equation,

We have to rearrange the equation to get V2 as,

Now plugin the values as,
V2 = 
= 1.5 L
So the new volume of the hydrogen gas is 1.5 L.
When solid ammonium nitrate is dissolved in water, it becomes completely dissociated and separates into the two ions, ammonium and nitrate. This forms a homogeneous solution, which is a mixture that has the same appearance and composition throughout. The reaction that takes place is shown below:
H₂O
NH₄NO₃₍s₎ --→ NH₄⁺ ₍aq₎ + NO₃⁻ ₍aq₎