Physics of Everyday Phenomena
9th Edition
ISBN: 9781259894008
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Question
Chapter 18, Problem 4CQ
To determine
Whether the hydrogen and oxygen needed in fuel cells are available in isolated forms or do they have to be extracted from compounds.
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1. For a Solid Oxide Fuel Cell that uses hydrogen as fuel, calculate the maximum energy
output possible at 800°C.
2. For a methanol fuel cell with total reaction equation and AG given, calculate the open
circuit voltage.
CH;OH + 3/2 O2
2H2O + CO2
AG = -698.2 kJ/mol
3. H2O is electrolyzed using an SOEC reactor. Inlet of the cathode has 30ml/min H20,
outlet of anode has 5ml/min O2, and applied current is 2A. Calculate the H2O conversion
and Faradaic efficiency (both in %). (Flow rates are given for gas phase in STP)
1. If the potential energy function is expressed as
a
U(r)
a) Show that the inter-molecular distance r, for which the potential energy is
1/6
2B
minimum is given by
a
b) Show that the inter-nuclear distance r for which the potential energy is zero is
given by r. × (2)-\/6.
a?
c) Show that the minimum potential energy is given by, Umin=--
4B
15. A star initially has 1040
deuterons. It produces energy via the
3
4
processes, H² +₁H² →→ ₁H³ + p and, H² + ₁H³ → ₂Heª + n.
1
the
If the average power radiated by the star is 10¹6 W,
deuteron supply of the star is exhausted in a time of the order
of
(a) 106 S
(c) 10 ¹² s
(b) 108 s
(d) 10¹6 s
The mass of the nuclei are as follows
M(H²) = 2.014 amu; M(n) = 1.008 amu;
M(p) = 1.007 amu; M(He* )= 4.001 amu.
4
Chapter 18 Solutions
Physics of Everyday Phenomena
Ch. 18 - Prob. 1CQCh. 18 - Prob. 2CQCh. 18 - Prob. 3CQCh. 18 - Prob. 4CQCh. 18 - Prob. 5CQCh. 18 - Prob. 6CQCh. 18 - Prob. 7CQCh. 18 - Prob. 8CQCh. 18 - Prob. 9CQCh. 18 - Prob. 10CQ
Ch. 18 - Prob. 11CQCh. 18 - Prob. 12CQCh. 18 - Prob. 13CQCh. 18 - Prob. 14CQCh. 18 - Prob. 15CQCh. 18 - Prob. 16CQCh. 18 - Prob. 17CQCh. 18 - Prob. 18CQCh. 18 - Prob. 19CQCh. 18 - Prob. 20CQCh. 18 - Prob. 21CQCh. 18 - Prob. 22CQCh. 18 - Prob. 23CQCh. 18 - Prob. 24CQCh. 18 - Prob. 25CQCh. 18 - Prob. 26CQCh. 18 - Prob. 27CQCh. 18 - Prob. 28CQCh. 18 - Prob. 29CQCh. 18 - Prob. 30CQCh. 18 - Prob. 31CQCh. 18 - Prob. 32CQCh. 18 - Prob. 33CQCh. 18 - Prob. 34CQCh. 18 - Prob. 35CQCh. 18 - Prob. 1ECh. 18 - Prob. 2ECh. 18 - If 112 g of silicon (Si) react completely with 64...Ch. 18 - Prob. 4ECh. 18 - Prob. 5ECh. 18 - How many electrons would be required to produce 12...Ch. 18 - Prob. 7ECh. 18 - Prob. 8ECh. 18 - Prob. 9ECh. 18 - Prob. 10ECh. 18 - Prob. 11ECh. 18 - Prob. 12ECh. 18 - An electron beam in a cathode-ray tube passes...Ch. 18 - Prob. 2SPCh. 18 - Prob. 3SPCh. 18 - Prob. 4SP
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