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The mass of 18 ml of water (H2O) at 4° C is equal to Answer: a 18 g Explanation: Desity of water is approximately 1 g cc So 18 ml of water weights 18 gm Weight = volume * density Number of moles = weight molecular weight So here in 18 gm water equal to 1 mole So it contain 6 022*10^23 molecules ie avagadro number of molecules