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Physical Chemistry
Calculate the enthalpies of combustion of methanol if the enthalpies of formation of CO2, H2O and CH3OH are -393kj/mol, -285.8kj/mol and -239.0 kj/mol.
Physical Chemistry
Calculate the enthalpies of methanol if the enthalpies of formation of CO2,H2O and CH3OH are respectively -393.5kj/mol,-285.8kj/mol and -239.0kj/mol.
Physical Chemistry
The following information was recorded for a calorimeter, complete the given table,
and calculate e the heat capacity heat of water)
Volume of cold water T1 (cold water) Volume of hot water T2(hot water)
Tf
of the calorimeter (use 4.184 J g-1 °C-1 as the specific
100 ml 23°C 100 ml 48°C 35.5°C
∆t (cold water)
................
∆t (hot water)
................
Q\ (cold water)
...............
Q\ (cold water)
..................
and calculate e the heat capacity heat of water)
Volume of cold water T1 (cold water) Volume of hot water T2(hot water)
Tf
of the calorimeter (use 4.184 J g-1 °C-1 as the specific
100 ml 23°C 100 ml 48°C 35.5°C
∆t (cold water)
................
∆t (hot water)
................
Q\ (cold water)
...............
Q\ (cold water)
..................
Physical Chemistry
During a neutralization reaction, a student combined 100 ml of 0.5 M HCl with 100 ml of 0.5 M of NaOH and recorded a change of temperature from 24.3 to 26.7. Determine ∆H for the given reaction (knowing that Ccal=335 J/°C):
NaOH(aq) + HCl(aq) →NaCl(aq) + H2O(L)
NaOH(aq) + HCl(aq) →NaCl(aq) + H2O(L)
Physical Chemistry
An electric light bulb has a volume of 200cm3, if contains argon gas at a temperature of 1.1×10 and a temperature of 25°C. When the light is switched on, the pressure increases to a steady 1.8 ×10 Pa. What is the temperature of the argon in the electric light bulb that creates this new steady pressure?
Physical Chemistry
Write the resonance structures of formate ion. What do you infer regarding the relative
bond length values of two C−O bonds in it? Explain the reason.
bond length values of two C−O bonds in it? Explain the reason.
Physical Chemistry
A poil must be kept between 7.2 to 7.8. If a pool held 3.5 x 10^4L of water. Calculate
a) the minimum acceptable hydrogen ion concentration
b) the number of hydroxonium ions that must be present in the swimming pool when the pH is 7.8
c) the number of moles of HCl that would need to be added to the pool to change the pH from 7.8 to 7.2
d) the number of concentrated HCl ( 12mol L^-1) that would be need to be added to the pool to achieve this pH.
a) the minimum acceptable hydrogen ion concentration
b) the number of hydroxonium ions that must be present in the swimming pool when the pH is 7.8
c) the number of moles of HCl that would need to be added to the pool to change the pH from 7.8 to 7.2
d) the number of concentrated HCl ( 12mol L^-1) that would be need to be added to the pool to achieve this pH.
Physical Chemistry
Write down the structures of stereoisomers of 2, 3–pentanediol. Identify the
enantiomeric pairs.
enantiomeric pairs.
Physical Chemistry
Water at 60°F is pumped from a reservoir to the top of a mountain through in 6-in. Schedule 120 pipe at an average velocity of 12ft/s. The pipe discharges into the atmosphere at a level 3000ft above the level in the reservoir. The pipeline itself is 4500ft long. Of overall efficiency to the pump and the motor driving it is 70% and the cost of electric energy to the motor is 4 cents per kilowatt hour, what is the hourly energy cost for pumping this water? (In fluid mechanics)
Physical Chemistry
A steel pipe 2ft in diameter carries water at about 15ft/s. If the pipe has a roughness of 0.0003ft, could the capacity be increased by inserting a smooth plastic liner that reduces the inside diameter to 1.9ft ? Calculate the change in pressure drop for the same flow and the change in capacity for fixed pressure drop. (In fluid mechanics)
