In an experiment, 7.2g of potassium chloride is added for every liter of water.Using the conversion factor 1 mL = 1 cm³ write the salt concentration in terms of  kg/m³ 

• A. 2.7 kg /m³
• B. 2.4 kg /m³
• C. 1.2 kg /m³
• D. 7.2 kg /m³

Answer: (D)