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how many moles of chlorine gas would occupy a volume of 35.5L at a pressure of 100.0 kpa and a temperature of 100. c? after determining the number of moles calculate the number of grams of chlorine (cl2) contained in this container
How many mL of HNO3 concentrate are needed to prepare 250 ML of solution 4%
Commercial electrolytic cells for producing aluminum
operate at 5.0 V and 100,000 A.
(a) How long does it take to produce exactly 1 metric ton (1000 kg)
of aluminum?
(b) How much electrical power (in kilowatt-hours, kW·h) is used
(1 W = 1 J/s; 1 kW·h = 3.6×103
kJ)?
(c) If electricity costs $0.123 per kW·h and cell efficiency is 90.%,
what is the cost of electricity to produce exactly 1 lb of aluminum?
Like any piece of apparatus, an electrolytic cell operates at
less than 100% efficiency. A cell depositing Cu from a Cu2+ bath operates for 10 h with an average current of 5.8 A. If 53.4 g of
copper is deposited, at what efficiency is the cell operating?
Zinc plating (galvanizing) is an important means of corro-
sion protection. Although the process is done customarily by dip-
ping the object into molten zinc, the metal can also be electroplated
from aqueous solutions. How many grams of zinc can be depos-
ited on a steel tank from a ZnSO4 solution when a 0.855-A current
flows for 2.50 days?
Distinguish which among the following chemical reactions is (are) combustion reaction(s):
a) 25= + <= → 25=<
b) 2!054<Q → !0=4<Q + 4<= + 5=<
c) 24U=5=p + 37<= → 24 4<= + 26 5=<
d) 4Q5p< + 4<= → 34<= + 35=<
A voltaic cell consists of an Mn/Mn2+ half-cell and a Pb/Pb2+
half-cell. Calculate [Pb2+] when [Mn2+] is 1.4 M and Ecell is 0.44 V.
What are E°
cell and ΔG° of a redox reaction at 25°C for
which n = 1 and K = 5.0×10−6?
When a clean iron nail is placed in an aqueous solution of
copper(II) sulfate, the nail becomes coated with a brownish-black
material.
(a) What is the material coating the iron?
(b) What are the oxidizing and reducing agents?
(c) Can this reaction be made into a voltaic cell?
(d) Write the balanced equation for the reaction.
(e) Calculate E°
cell for the process.
In acidic solution, O3 and Mn2+ ions react spontaneously:
O3(g) + Mn2+(aq) + H2O(l) ⟶
O2(g) + MnO2(s) + 2H+(aq) E°
cell = 0.84 V
(a) Write the balanced half-reactions.
(b) Using Appendix D to find E°
ozone, calculate E°
manganese.
