Hello!
The ball took up 2,9L
To solve this problem, we should apply the
ideal gas law and clear for n (the number of moles), as this value doesn't change when Devin takes the ball to the garage:

Now, we should clear this equation to find V2, as this is the value we are looking for:

≈2,9L
Have a nice day!
The first one is abundant
Conduction causes it to become hot, the molecules in the hot soup want to be on the cold spoon so they move to it, making the spoon hot.
Sodium chloride has a high meltint point because of the strong electrostatic attraction between its positive and negative ions.
Half life is 15 hours
so 30 hours would be 2 half lives
after 15 hours it would be at 50%
after 15 more hours it would be at 50% of 50%
so .5 x .5 = .25
it would be 25%