# chemistry

The heat of solution of potassium acetate (KC2H3O2) in water is -15.3 kJ/mol.
If 18.8 g of KC2H3O2(s) is dissolved in 655 mL of water that is initially at 25.8 °C, what will be the final temperature (in degrees Celcius) of the resulting aqueous solution?
(Assume no heat exchange with the surroundings.)

1. 👍 0
2. 👎 0
3. 👁 795
1. q = -15.3 kJ/mol x (18.8/molar mass KC2H3O2) = approx - 3.03 kJ or 3030 J.
Then -3030 = mass H2O x specific heat H2O x Tfinal-Tinitial)
Substitute the numbers and solve for Tfinal

1. 👍 0
2. 👎 1
2. (18.8 g KC2H3O2) / (98.1423 g KC2H3O2/mol) x (15.3 kJ/mol) = 2.931 kJ = 2931 J

(2931 J) / (4.186 J/g·°C) / (655 g + 18.8 g) + 25.8 °C = 26.84°C = 26.8°C

1. 👍 1
2. 👎 0

## Similar Questions

1. ### chemistry 11

Food manufacturers sometimes add calcium acetate to puddings and sweet sauces as a thickening agent. What volume of 0.500 mol/L calcium acetate, Ca(CH3COO)2 (aq), contains 0.300 mol of acetate ions? So I've been over this a

asked by julie on December 17, 2014
2. ### Chemistry

The heat of fusion of water is 6.01 kJ/mol. The heat capacity of liquid water is 75.3 J/mol • K. The conversion of 50.0 g of ice at 0.00°C to liquid water at 22.0°C requires how much kJ of heat? Can someone explain how to do

asked by Anonymous on September 20, 2010
3. ### Chemistry

The heat of neutralization of HCl(aq) and NaOH(aq) is -55.90 kJ/mol of water produced. If 50.00 mL of 1.16 M NaOH at 25.15 ºC is added to 25.00 mL of 1.79 M HCl at 26.34 ºC in a plastic-foam cup calorimeter, what willthe

asked by Alexis on November 1, 2015
4. ### Chemistry

Answer the following questions about energy changes associated with heating and cooling a substance. Use the quantities in the table for your calculations. (table) Specific heat of water /4.184J/g*K dealta H vap for water /40.7

asked by Morgan on January 31, 2015

This is the second reaction: HCl(aq)+NaOH(aq)-->NaCl(aq)+H2O(l) (Heat of neutralization) This reaction involves mixing two solutions: 1.00 mol/L NaOH and 1.00 mol/L HCl. Trial 1: 48.0 mL of the NaOH solution is mixed with 47.5 mL

asked by tessa on January 1, 2012
1. ### Chemistry

When 3.2 g of ammonium chloride is dissolved in 75 g of water, the temperature of the solution decreases from 22.8°C to 20.1°C. What is the energy of dissolution of NH4Cl per mole? (The molecular mass of NH4Cl = 53.49 g/mol, and

asked by Morgan on December 10, 2014
2. ### Chemistry

The heat of solution of ammonium chloride is 15.2 kJ/mol. If a 6.187 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 26.5°C, what is the minimum temperature reached by the solution? [specific heat of water =

asked by Chris on May 5, 2014
3. ### chemistry

How much energy (in kilojoules) is needed to heat 5.45g of ice from -12.0 C to 32.0 C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K x mol) for ice and 75.3 J/(k x mol) for liquid water

asked by emily on December 2, 2010
4. ### college chem

calculate the amount of energy (in kj) necessary to convert 457 g of liquid water from 0 Celecius to water vapor at 167 celcius. the molar heat of vaporization (Hvap) of water is 40.79 jk/mol. the specific heat for water is 4.187

asked by luis fernandez on February 4, 2013
5. ### AP Chem

A solution of potassium phosphate is mixed with a solution of calcium acetate. I am supposed to write a net ionic equation. Doesn't need to be balanced. Here is what I did: K3PO4(aq) + Ca(C2H3O2)2 --> KC2H3O2 + Ca3PO4 3K+ + PO4-3