CHEM- FP

posted by .

The boiling point of water at 735mmHg is 99.073°C. What mass of BaCl2 should be added to 2.28kg water to increase the boiling point to 100.000°C ?
Kb for water = 0.510 K kg mol-1
2589 g
777 g
734 g
288 g
863 g

• CHEM- FP -

delta T = i*Kb*m
Solve for m

molality = moles/kg
Solve for moles

moles = grams/molar mass
Solve for grams.

• CHEM- FP -

dT= 100- 99.073= 0.927
dT= m Kb i
0.972= m*0.51*3= 0.972/0.510*3
=0.606 mol BaCl2/ 2.28kg
0.606*2.28kg= 1.38g
mass BaCl2= 1.38g*208.23g/mol
=288g

Similar Questions

1. chemistry

The boiling point of water at 735 mmHg is 99.07C. What percent by mass of NaCl should be present in a water soln to raise the boiling point to 100.0C?
2. chem

The normal boiling point of water is 100.00 degrees celsius and the enthalpy of vaporization at this temperature is 40.657kj/mol. What would be the boiling point of water if it were based on a pressure of 1 bar instead of the standard …
3. Chemistry

Which of the following statements about boiling points are false: A. the boiling point of 0.1 m KF(aq) is lower than the boiling point of 0.1 m ethanol(aq) B. the boiling point of a 0.5 m aqueous solution of NaOH is the same as the …
4. chemistry

the boiling point of water at 735mmHg is 99.073 degrees celcius. What mass of NaCl should be added to 3.11kg water to increase the boiling point to 100.000 degrees celcius?
5. chemistry

The boiling point of water at 735mmHg is 99.073C. What mass of NaCl should be added to 3.11kg water to increase the boiling point to 100.000C. Kb for water = 0.510K kg mol-1.
6. Chemistry

Pure water boils at 100ºC (212ºF). When a substance is added to the water the boiling point increases due to what is referred to as the boiling point elevation. (a) What is the molecular mass of sucrose (C₁₂H₂₂O₁₁)?
7. chemistry

Which of the following statements about boiling points are true?
8. chemistry

When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree. If 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be …
9. chemistry

What is the predicted change in the boiling point of water when 4.00 g of barium chloride (BaCl2) is dissolved in 2.00 kg of water?
10. physical chemistry

Estimate the boiling point of 250 cm3 of water to which 12.6 g of phenol(C6H5OH) has been added. Treat the solution as ideal.( water of boiling point elevation is 0.51K/mol)

More Similar Questions