Explain the temperature of the system decreases

Reference no: EM13518234

When solid ammonium chloride, NH4Cl, is added to excess water, a solution forms and the temperature of the system decreases. In a certain experiment, 0.10 mole of NH4Cl is added to a liter of water in an open glass beaker at 298 K. All the salt dissolves in water and there is a decrease in temperature.

1. Explain how the enthalpy, entropy, and free energy of this system change as the dissolving process proceeds.

2. Of the three parameters, ÄS, ÄH, and ÄG, specified in part 1, which has a sign different from the other two? Explain.

3. If this process were carried out in a plastic foam cup rather than a glass beaker, how would the magnitude of the temperature change of the solution be affected? How would the apparent heat of solution be affected? Explain.

4. How is sign and magnitude of the free energy change for this dissolving process affected by an increase in temperature? Explain.

Reference no: EM13518234

Questions Cloud

Explain how old is the fossil : A fossil was analyzed and determined to have a carbon-14 level that is 42.0 that of living organisms. How old is the fossil

Obtain at what temperature will their resistances be equal : At 20.0°C, a mainly silicon resistor has a resistance of 275 ?, and a tungsten resistor has a resistance of 752 ?. At what temperature will their resistances be equal

What is the power of one laser pulse : LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. What is the power of one laser pulse

What is the strength of the induced electric field on circle : A uniform magnetic field in a region of space changes at a rate of 5.000e-3 T/s. What is the strength of the induced electric field on a circle

Explain the temperature of the system decreases : When solid ammonium chloride, NH4Cl, is added to excess water, a solution forms and the temperature of the system decreases. In a certain experiment, 0.10 mole of NH4Cl is added to a liter of water in an open glass beaker at 298 K

Explain aqueous solution of ammonium chloride : Calculate the pH of a 0.17 M aqueous solution of ammonium chloride (NH4Cl) at 25°C. Assume that Kb for ammonia (NH3) is 1.8x10-5 at 25°C.

Explain at what point during a titration of a weak acid : At what point during a titration of a weak acid with a strong base does the pH = pKa? What ratio would cause pH pKa & pH pKa

What is the speed of the blood in the aorta : When the heart pumps blood into the aorta, the pressure gradient-the difference between the blood pressure inside the heart and the blood pressure in the artery-is an important diagnostic measurement. What is the speed of the blood in the aorta

Explain the half equivalence point in titrating of hco2h : What is the volume required of a 0.2 M KOH solution to reach the half equivalence point in titrating 25 mL of a 0.1 M HCO2H.

User Account

All Pages