What is sea water?
Sea water is a type of water from a sea or ocean. (1)
Sea water is also known as salt water. (1)

What does sea water contain?
% by mass:
oxygen 86% (1)
hydrogen 11% (1)
chlorine 2% (1)
sodium 1% (1)
magnesium 0.13% (1)
sulfur 0.091% (1)
calcium 0.04% (1)
bromine 0.0067% (1)
carbon 0.0028% (1)

sulfate
potassium
bicarbonate
bromide
borate
strontium
fluoride
silicate
iodide

total molar composition of seawater contains:
water (h2o) (1)
chloride (1)

Resources
1. https://en.wikipedia.org/wiki/Seawater

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