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Physical Chemistry
Given the half redox reaction below, what is the coefficient of the electron in the balanced half reaction in a basic medium CrO2^-4 + H2O --> Car(OH)3
Physical Chemistry
1) A 0.2 mole of an ideal gas expands from 9atm to 5 arm against a pressure of 5atm at 30°c. Calculate the work done in the process.
2) Calculate the work done by the process of combustion of 1 mole of acetylene at 25°c
2) Calculate the work done by the process of combustion of 1 mole of acetylene at 25°c
Physical Chemistry
Given the reaction 4PH3--> P + 6H2 , the half life of the reaction is 35.0s at 680°c. Calculate the time required for 95 of the Phosphine (PH4) to decompose.
2) The acid dissociation constant of a weak acid HA has a value of 1.0×10^-5mol/dm^3. What is the pH of a 0.10mol/dm^3 aqueous solution of HA?
3) Calculate the work done when 50g of iron react with excess HCl in a closed vessel of fixed volume. What is the work done in the reaction at 25°c? (Fe=56g/mol)
4)Given the following bond energies of the following molecules in Kj/mol. Be(Cl2)=243, Be(H2)=436, Be(HCl)=431. Calculate the enthalpy of the reaction 2H2 +2Cl2 --> 4HCl
2) The acid dissociation constant of a weak acid HA has a value of 1.0×10^-5mol/dm^3. What is the pH of a 0.10mol/dm^3 aqueous solution of HA?
3) Calculate the work done when 50g of iron react with excess HCl in a closed vessel of fixed volume. What is the work done in the reaction at 25°c? (Fe=56g/mol)
4)Given the following bond energies of the following molecules in Kj/mol. Be(Cl2)=243, Be(H2)=436, Be(HCl)=431. Calculate the enthalpy of the reaction 2H2 +2Cl2 --> 4HCl
Physical Chemistry
1)A reaction at 250°c is 4 times as fast as the same reaction at 150°c. Assume the frequency factor is constant, calculate the activation energy for the reaction.
2) 22400cm^3 of a gas at 0°c contains 6.02×10^23 molecules. Calculate the molecular density of the gas.
3) The oxidation state of C in CaC2O4 is ?
2) 22400cm^3 of a gas at 0°c contains 6.02×10^23 molecules. Calculate the molecular density of the gas.
3) The oxidation state of C in CaC2O4 is ?
Physical Chemistry
1)What is the ∆C° cell for the reaction below, given that its E°cell =1.78V
Au^3+ + 3CO --> 3CO^2+ + 2Au
2)Given the equation CH4 + 2O2 --> CO2 + 2H2O at a certain temperature. 2 moles of CH4 is consumed in 1 minute. Calculate the rate of production of water
Au^3+ + 3CO --> 3CO^2+ + 2Au
2)Given the equation CH4 + 2O2 --> CO2 + 2H2O at a certain temperature. 2 moles of CH4 is consumed in 1 minute. Calculate the rate of production of water
Physical Chemistry
A current of 13A is passed through an aqueous solution of an element M for 30 minutes and 4g of the element is found to be deposited. Calculate the charge on the ions of the element M (R.A.M of element M is 50)
Physical Chemistry
1) Given an unbalanced equation below, ( NO3)^2- --> (NH4)^+
What is the coefficient of the electron in the balanced half reaction.
2) A 5g Zinc metal reacts with excess HCl acid in a container placed in vacuum space according to the reaction below, calculate the workdone by gas against vacuum at 25°c
An + 2HCl --> ZnCl + H
What is the coefficient of the electron in the balanced half reaction.
2) A 5g Zinc metal reacts with excess HCl acid in a container placed in vacuum space according to the reaction below, calculate the workdone by gas against vacuum at 25°c
An + 2HCl --> ZnCl + H
Physical Chemistry
1) A second order reaction has a rate constant of 1.5 ×10^-5 and a frequency factor of 5.2 ×10^4 at80°c. What is the fraction of the activated molecules?
2) An electric heater rated (2A, 250V) is used to heat a liquid of specific heat capacity 5.2J/g/°c and a mass 400g contained in a calorimeter of thermal capacity 30Kj/°c. If the temperature rises from 20°c to 80°c. Calculate the heating time.
2) An electric heater rated (2A, 250V) is used to heat a liquid of specific heat capacity 5.2J/g/°c and a mass 400g contained in a calorimeter of thermal capacity 30Kj/°c. If the temperature rises from 20°c to 80°c. Calculate the heating time.
Physical Chemistry
A 60g of ethanol burnt in a bomb calorimeter of heat capacity 25Kj/°c which contains 50g of water of heat capacity 209J/°c. If the enthalpy of combustion of ethanol is 1235. Calculate the temperature rise of both calorimeters and the water inside. Molar mass of ethanol is 46.07g/mol
Physical Chemistry
Calculate the value of Cp for SO2 given that R= 8.314J/K/mol.
2)What is the binding energy per nucleon for an oxygen nucleus given that 1p = 1.0073amu and 1n = 1.0087amu?
2)What is the binding energy per nucleon for an oxygen nucleus given that 1p = 1.0073amu and 1n = 1.0087amu?
