In the laboratory you are asked to make a 0.375 m manganese(II) bromide solution

Question

In the laboratory you are asked to make a0.375 m manganese(II) bromidesolution using 19.9 grams of manganese(II)bromide.

How much water should you add ?

2)An aqueous solution is 36.0% by masssilver nitrate, AgNO3,and has a density of 1.41 g/mL.

The molality of silver nitrate in the solution is m.
In the laboratory you are asked to make a0.375 m manganese(II) bromidesolution using 19.9 grams of manganese(II)bromide.

How much water should you add ?

2)An aqueous solution is 36.0% by masssilver nitrate, AgNO3,and has a density of 1.41 g/mL.

The molality of silver nitrate in the solution is m.

Explanation / Answer

19.9 g MgBr2 *(1 mol / 184.1 g) *(1 kg water / 0.375 moles MgBr2) =0.288 kg or 288 grams MgBr2 Note 1 m   = 1 mol/ kg solvent

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