A hydroponic nutrient solution contains potassium nitrate.
350 cm3350\text{ cm}^3350 cm3 of this nutrient solution contains 1.26 g1.26\text{ g}1.26 g of potassium nitrate.
Calculate the mass, in grams, of potassium nitrate in 2.5 dm32.5\text{ dm}^32.5 dm3 of this nutrient solution.