11.The mole fraction of water in a solution containing 117 g sodium chloride and 900 g of water is

12.During synthesis of ammonia from its constituent elements, the volume of the product relative to the total volume of thereacting species is

13.50 ml of samples of distilled water, ordinary tap water and boiled tap water requires 2 ml, 26 and 10 of soap solution respectively to form permanent lather. The ratio of permanent hardness to temporary hardness in tap water is

14.The number of moles of NaCl in 3 L of 3 M NaCl solution is

15.The mole fraction of solute in 1 molal aqueous solution is