Chemisty

posted by .

A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water.

a) What is the molality of the resulting solution?

b) What is the mole fraction of water in this solution?

• Chemisty -

molality=molessugar/kgsolvent
= 3.44/(molmassSucrose*.118)

Mole fraction moles solute/totalmoles
where moles solute=3.44/molmassSucrose
moles water=18/118

and total moles=moles solute+moles water.

• Chemisty -

Just a slight correction to a typo above.
mols H2O = 118/18

B)
moles of h2o=118g/18(g/mol)=6.5556 mol
moles of c12h22O11= 3.44g/342.3(g/mol)=0.10049 mol
6.5556 mol/(6.5556 mol + 0.10049 mol= 0.984902 mol

A)
M= (0.10049)/(0.00344 kg + 0.118 kg)= 0.82749 m c12h22O11

Similar Questions

1. chemistry

A solution is prepared by dissolving 17.1grams of sucrose, c12h22o11, in 275grams of h20. what is the molality of that 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 15.0 g of NH3 in 250.g of water. The density of the resulting solution is 0.974 g/ml. The mole fraction of NH3 in the solution is?
4. CHEMISTRY

A solution is prepared by dissolving 15.0 g of NH3 in 250 g of water. The density of the resulting solution is 0.974 g/mL. The mole fraction of NH3 in the solution is __________. A) 16.8 B) 0.940 C) 0.0597 D) 0.922 E) 0.0640
5. 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
6. Chemistry

Reviewing for final (this should be basic but...I am stuck): Describe how you would prepare 500.0 grams of a solution of sucrose, C12H22O11, in water which the mole fraction of sucrose is 0.125. I feel like somehow this is a molality …
7. chemistry

A solution is prepared by dissolving 20.2 {\rm mL} of methanol ({\rm{CH}}_3 {\rm{OH}}) in 100.0 {\rm mL} of water at 25 ^\circ {\rm C}. The final volume of the solution is 118 {\rm mL}. The densities of methanol and water at this temperature …
8. chem

A solution is prepared by dissolving 75.0 grams of sucrose (C12H22O11) in enough water to produce 1.00L of solution. What is the molarity of this solution?