If you can't answer a question, then make an educated guess.
we are given
a swimming pool contains 2,850 kiloliters (kL) of water
2,850 kiloliters (kL)=2850000L
we know that


Firstly , we will find for 1L

now, we can multiply both sides by 2850000



so,
a swimming pool contains 752972.25892gal of water...........Answer
Answer:
Sodium
(Na)
Just count the electrons and search which atom it is.
Only writing this because need to ask a question sorry