Answer to Question #239729 in General Chemistry for Selene

Question

 

1. How would you prepare a 1.8% NaBr (w:v) aqueous solution?

 

 

2. In a biochemical assay, a chemist needs to add 2.93 g of glucose to a reaction mixture. Calculate the volume in mL of a 1.35M glucose solution she should use for the addition.

 

 

3. The concentrated sulfuric acid we use in the laboratory is 98.0 percent H₂SO₄ by mass. Calculate the molality and molarity of the acid solution. The density of the solution is 1.83g/mL

Answer 1

1. To make this solution, you would dissolve 3.3 g

of sodium bromide in 20.00 mL

of distilled water, then add enough water to ensure that the final volume of the solution is equal ot 50.00 mL

2.Molar mass of glucose = 180.156

= 180.156/2.93

= 61.49ml