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Physical Chemistry
Calculate ΔS when one mole of steam at 100 ℃ is converted into ice at 0 ℃. Average specific heat of water = 4.184 x 103 JK-1 kg-1; heat of vaporization at boiling point = 2490.6 x 103 J kg-1; heat of fusion at freezing point = 333.555 x 103 J kg-1.
Physical Chemistry
Ten grams of nitrogen is mixed with 5 grams of O2 and held at 25 degree Celcius at 0.750 bar.
a) What are the mole fractions of N2 and O2?
b) What are the partial pressures of N2 and O2?
c) What is the molar volume assuming the molecules do not interact?
d) What is the actual volume assuming the molecules do not interact?
a) What are the mole fractions of N2 and O2?
b) What are the partial pressures of N2 and O2?
c) What is the molar volume assuming the molecules do not interact?
d) What is the actual volume assuming the molecules do not interact?
Physical Chemistry
How can you change the chemical equilibrium to benefit the company? What benefits will be realized?
Physical Chemistry
Consider the following reaction in acidic aqueous medium:
(H2O2) +(2H+) +(I−) > (I2)+ (2H2O)
The following mechanism was suggested for the above reaction.
(H+) +(I−) > HI Fast
(HI) +(H2O2) > (H2O) +(HOI) Slow
(HOI) +(I−) > (I2) +(OH−) Fast
(OH−) + (H+) > (H2O) Fast
Show that the overall order is two.
(H2O2) +(2H+) +(I−) > (I2)+ (2H2O)
The following mechanism was suggested for the above reaction.
(H+) +(I−) > HI Fast
(HI) +(H2O2) > (H2O) +(HOI) Slow
(HOI) +(I−) > (I2) +(OH−) Fast
(OH−) + (H+) > (H2O) Fast
Show that the overall order is two.
Physical Chemistry
which sample contains total of 6.02 x 10^23 atoms?
72.6g of Germanium
104g of Chromium
24.0g of Carbon
16.0g of Sulfur
72.6g of Germanium
104g of Chromium
24.0g of Carbon
16.0g of Sulfur
Physical Chemistry
The reaction between solid white phosphorus and oxygen produces solid tetraphosphorusdecoxide (P4O10).
Physical Chemistry
Could you explain the general trend in first ionisation energies for the elements Na to Cl
Physical Chemistry
Given that the volume of gaseous products produces in the unit of dm^3g^-1 at STP in an explosion caused by nitroglycerine is 0.9 times of the volume of gaseous products produced in the same conditions in the explosion caused by picric acid and the heat evolved in the unit of Jg^-1 in the explosion cause by nitroglycerine is 1.9 times of the heat evolved (Jg^-1) in the explosion caused by picric acid.
i) Calculate the power index (PI) for nitroglycerine at STP.
ii) If the sum of the volume of gaseous products produced at STP in the explosion caused by picric acid and nitroglycerine is 1.577 dm^3g^-1 , calculate the volume of gaseous products produced in the unit of dm^3g^-1 at STP in the explosion caused by picric acid and nitroglycerine.
i) Calculate the power index (PI) for nitroglycerine at STP.
ii) If the sum of the volume of gaseous products produced at STP in the explosion caused by picric acid and nitroglycerine is 1.577 dm^3g^-1 , calculate the volume of gaseous products produced in the unit of dm^3g^-1 at STP in the explosion caused by picric acid and nitroglycerine.
Physical Chemistry
In a simple firing experiment, 1.03g of an explosive material, which can produce a gas product up to 9.2 dm3 per gram if detonated, was packed in a handgun ammunition cartridge and then triggered to detonate to propel a projectile weighed 2 g out of the barrel. The bullet velocity for this firing is 284 m/s and the factor η for the inevitable inefficiency of the energy transfer from the explosion to the projectile is 0.13. Calculate the power index for this explosive material by comparing to the picric acid, which can evolve 3150 J/g of heat and produces 0.831 dm3 of gas for every gram of detonation.
Physical Chemistry
The rate constant of second order reaction is 5.7 x 10-5 dm3 mol-1
s
-1 at 298 K and 1.64 x
10-4 dm3 mol-1
s
-1 at 313 K. Calculate the activation energy and Arrhenius-pre
exponential factor.
s
-1 at 298 K and 1.64 x
10-4 dm3 mol-1
s
-1 at 313 K. Calculate the activation energy and Arrhenius-pre
exponential factor.
