Discussion
About how much concentration of dissolved salt (NaCl) present in the open ocean ?
Answer: C
Open ocean water holds about 30 g of dissolved salt per kg of water.
The average salinity of sea water is about 35 parts per thousand, that is 35 g of dissolved salts per kilogram, of which sodium chloride makes up the large majority. In terms of the options, about 30 g of salt per kg is the closest value.
10 and 20 g/kg are typical of brackish water in estuaries or semi-enclosed seas. More than 100 g/kg is found only in hypersaline lakes and lagoons such as the Dead Sea.
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