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Physical Chemistry
Consider the standard conditions. What would happen in a system with Sn4+, Sn2+, Cu+ and Cu, i.e. what are the redox reactions? What would be the theoretical E0 for this system?
Physical Chemistry
Calculate how much (as grams) the following elements are needed to produce a charge equal to the Faraday’s constant. Electron charge is 1.602*10^–19 As
a) Li (using Li/Li+)
b) Zn (using Zn/Zn2+)
a) Li (using Li/Li+)
b) Zn (using Zn/Zn2+)
Physical Chemistry
The weight of both electrodes in Daniell cell is 200 g. The solutions in the cell are [ZnSO4] = 1 M, [CuSO4] = 2.5 M. Volume of both solution is 5 liters.
a) Calculate the initial cell voltage.
b) Calculate the cell voltage after use of 30 h with a current 1 A.
c) What is the weight of the zinc electrode after 30 h/1 A?
d) What is the weight of the copper electrode after 30 h /1 A?
d) How long can you use the battery with a current of 1 A?
a) Calculate the initial cell voltage.
b) Calculate the cell voltage after use of 30 h with a current 1 A.
c) What is the weight of the zinc electrode after 30 h/1 A?
d) What is the weight of the copper electrode after 30 h /1 A?
d) How long can you use the battery with a current of 1 A?
Physical Chemistry
Reaction
2NO+2H2 --> N2+HO2
Experiment Initial NO Initial H2 Initial Rate
1 .420 .122 .136
2 .210 .122 .0339
3 .210 .244 .0678
4 .105 .488 .0339
1) Determine the order of each reactant and the total order of the reaction
2) Calculate the numerical value of the rate constant and specify the units
3) Write the rate law expression for the reaction above.
2NO+2H2 --> N2+HO2
Experiment Initial NO Initial H2 Initial Rate
1 .420 .122 .136
2 .210 .122 .0339
3 .210 .244 .0678
4 .105 .488 .0339
1) Determine the order of each reactant and the total order of the reaction
2) Calculate the numerical value of the rate constant and specify the units
3) Write the rate law expression for the reaction above.
Physical Chemistry
International computer communications are carried by optical fibres,laid along the ocean floor. If one strand of optical fibre weighs 0.00119Ib/m.What is the total mass (in Kg) of a cable made of six strands of optical fibre,each long enough to link New Yorkand Paris(8850km).
Physical Chemistry
what is th eroot-mean squared velocity of a sulfur dioxide, SO2, molecule at 275C ?
Physical Chemistry
CaC12(aq)+Na2CO3(aq) > CaCO3(s)+ 2NaC1(aq)
how many moles of sodium carbonate were initially present? 1.06g of sodium carbonate
how many moles of sodium carbonate were initially present? 1.06g of sodium carbonate
Physical Chemistry
The analysis of a hydrocarbon revealed that it was 85.6281% C and 14.3719% H by mass. When 2.94 g of the gas was stored in a 1.4 L flask at −32.1762C, it exerted a pressure of 450 Torr. What is the molecular formula of the hydrocarbon?
Physical Chemistry
Consider a composite entity consisting of a system [= 1.2028 moles of Ar(g) – CV,m = 3/2 R]
and its surroundings [= ice/water bath containing 1.000 kg H2O(L) & H2O(s) at a constant
pressure of 1.000 atm]. The ice/water bath maintains the total entity at a constant
temperature by supplying heat to the system (or absorbing heat from the system) as needed.
The system+surroundings is adiabatic; that is, heat is exchanged only between the gas and
the ice/water bath. Initially, the gas exerts a pressure of 2.732 bar; the gas then expands to a
final pressure of 1.366 bar against a constant external, opposing pressure of 1.200 bar.
1. Calculate q for the system.
2. Do the calculations necessary to demonstrate that this process requires that 3.60
g of liquid water must freeze in the ice/water bath to account for your answer to #1.
3. Calculate ΔS for the system for this process.
4. Calculate ΔSTotal = ΔSsystem + ΔSsurroundings for this process.
and its surroundings [= ice/water bath containing 1.000 kg H2O(L) & H2O(s) at a constant
pressure of 1.000 atm]. The ice/water bath maintains the total entity at a constant
temperature by supplying heat to the system (or absorbing heat from the system) as needed.
The system+surroundings is adiabatic; that is, heat is exchanged only between the gas and
the ice/water bath. Initially, the gas exerts a pressure of 2.732 bar; the gas then expands to a
final pressure of 1.366 bar against a constant external, opposing pressure of 1.200 bar.
1. Calculate q for the system.
2. Do the calculations necessary to demonstrate that this process requires that 3.60
g of liquid water must freeze in the ice/water bath to account for your answer to #1.
3. Calculate ΔS for the system for this process.
4. Calculate ΔSTotal = ΔSsystem + ΔSsurroundings for this process.
Physical Chemistry
The label on a stock bottle of acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, what is the volume of the acid in cm3 required to prepare 250cm3 of 1.5 molar acid ?
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#331389 on Nov 2022
#331389 on Nov 2022