If a sample of salt water has a measured concentration of 21.0 ppt, how many grams of salt are there in a 2.05 kg sample of this salt water?

grams of salt = 43.05 grams

Explanation:

Salinity is the measure of the amount of dissolved salt in water. Salinity is usually expressed in part per thousand (ppt) or grams of the salt per kilogram of water. In a situation where you have 1 gram of salt and 1 kg of water, the salinity is 1 g/kg or 1 ppt.

Since 1 ppt denotes having 1 g of salt in 1000 grams of water, 21 ppt will be having 21 grams of salt in 1000 grams of water.

if 21 grams of salt → 1 000 g of water

? grams of salt will be in 2050 g of water

cross multiply

grams of salt = (2050 * 21) / 1000

grams of salt = 43050/1000

grams of salt = 43.05

grams of salt = 43.05 grams