I think is it the flask the bottle cause i had the same thing and i got it right idk maybe :)
Explanation:
Since, it is given that carbon dioxide is completely removed by absorption with NaOH. And, pressure inside the container is 0.250 atm.
For Kr = 0.250 atm and pressure 
will be calculated as follows.
= (0.708 - 0.250) atm
= 0.458 atm
Now, we will calculate the mole fraction as follows.
= 0.646
Kr = 
= 0.353
Now, we will convert into gram fraction as follows.
= 28.424
Kr = 
= 29.57
Therefore, total mass is calculated as follows.
Total mass = (28.424 + 29.57)
= 57.994
Hence, the percentage of and Kr are calculated as follows.
= 49%
Kr = 
= 51%
Hence, amount of and Kr present i mixture is as follows.
in mixture = 
= 17.15 g
Kr = 
= 17.85 g
Thus, we can conclude that 17.15 g of is originally present and 17.85 g of Kr is recovered.
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