# Chemistry

posted by .

What is the molality of a solution prepared by dissolving 2.00 mL of bromine (d = 3.103 g/mL) in 125 mL acelic acid, HC2H3O2 (d = 1.05 g/mL)
a. 0.301
b. 0.335
c. 0.296
d. 0.593

• Chemistry -

Show your work and I'll help you through it. I've dibe enough of these that you should know how to do these. The correct answer is listed.

• Chemistry -

3.10g/ml *1mole Br/79.0g =0.039 mol/ml
0.039mol/ml * 2.00ml =0.0784 mol
1.05 g/ml * 1mol/60g = 0.0175 mol/ml * 125 ml =2.18 mole

I don't know where I am going wrong becaus ethe answers are not same????????

• Chemistry -

What is the molality of a solution prepared by dissolving 2.00 mL of bromine (d = 3.103 g/mL) in 125 mL acelic acid, HC2H3O2 (d = 1.05 g/mL)
a. 0.301
b. 0.335
c. 0.296
d. 0.593
molality = moles/kg solvent.
2.00 mL bromine = what mass?
2.00 mL x 3.103 g/mL = 6.206 grams. This is the solute. How many moles is that? 6.206 x (1 mole/159.81 g) = 0.0388 moles solute.

125 mL acetic acid = what mass?
125 mL x 1.05 g/mL = 131.25 grams. This is the solvent.
m = moles solute/kg solvent =
=0.0388/0.13125 = 0.29588 which rounds to 0.296 to three significant figures (which is what you are allowed with 2.00 mL and 125 mL). That's answer c.

## Similar Questions

1. ### Chemistry

A solution was prepared by dissolving 0.817g of sulfur S8, in 100.0g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution
2. ### chemistry

A solution is prepared by dissolving 17.1grams of sucrose, c12h22o11, in 275grams of h20. what is the molality of that solution?
3. ### chemistry

A solution is prepared by dissolving 17.1grams of sucrose, c12h22o11, in 275grams of h20. what is the molality of that solution?
4. ### CHEMISTRY- molality

a sucrose solution was prepared by dissolving 13.5g sucrose in enough water to make 100ml of solution. the density is 1.050gml. calculate molality
5. ### Chemistry

what is the molality of a solution prepared by dissolving 13.0 g of Ba(NO3)2 in 450 g of water?
6. ### ecc

A solution was prepared by dissolving 0.834 g of sulfur, S8, in 100.0 g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution. (Use the table from the textbook.)
7. ### chemistry

A solution was prepared by dissolving 0.834 g of sulfur, S8, in 100.0 g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution. (Use the table from the textbook.)
8. ### chemistry

A solution was prepared by dissolving 0.834 g of sulfur, S8, in 100.0 g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution. (Use the table from the textbook.)
9. ### chemistry

A solution was prepared by dissolving 0.834 g of sulfur, S8, in 100.0 g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution. (Use the table from the textbook.)
10. ### CHEMISTRY

Dye of iodine is prepared by dissolving in ethanol , and 1% ( one percent ) of this solution contains 10 g of solute in 1000 g of solution 1) how many grams of solvent is there in the solution ?

More Similar Questions