Ocean salinity is 35 ppt. this means there are
35 grams of salt for every 10 grams of water
35 grams of salt for every 100 grams of water
35 grams of salt for every 1,000 grams of water
35 grams of salt for every 10,000 grams of water

35 grams of salt for every 1,000 grams of water

Explanation:

Salinity is the content of salt dissolved in a body of water. It is generally defined as the total amount in grams of dissolved salt contained in a kilogram (or 1000 grams) of seawater, and this is called :

So, if we have a salinity of this is equivalent to 35 grams of disolved salts in 1000 grams of seawater:

This is in fact a dimensionless value, which was defined in 1902 in this way by the amount of sodium chloride present in water as a measure of its salinity.