A sample of sea water has a salinity of 35 parts per thousand (35‰). How many grams of dissolved salts are present in 2 kg of this water?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 70 g
Salinity is the amount of salt in grams dissolved in 1,000 g (1 kg) of sea water. So 1 kg holds 35 g of salt and 2 kg holds 2 × 35 = 70 g.