Question

19. How many grams of Barrium chloride
are
needed to prepare 200cm cube
of 0.25 molar NaCl solution​

Answer 1

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So, one mole of NaCl weighs 58.44 g. A 2.5 M solution is 2.5 moles per liter (Molarity is just the number of moles per liter). Therefore, 0.5 L would contain 1.25 mol. Hence, you would need 1.25 × 58.44 g = 73 g.