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Positron emission from 11C, 11 6C ¡ 11 5B + 0 + 1e, occurs with release of 2.87 * 1011 J per mole of 11C. What is the mass change per mole of 11C in this nuclear reaction? The masses of 11B and 11C are 11.009305 and 11.011434 amu, respectively
The surface casing of the well is to be cemented to the surface with a single-stage cementing using Class G cement + 5% bentonite. Estimate the total number of sacks required for cement & bentonite and total time required to seal surface casing with 20% excess of the total volume of slurry.
Additional information: The shoe track is 60 ft and has a rathole of 10ft. 15 minutes required to release the plugs with 15 sacks/min of mixing rate and 250 gal/min of pumping rate.
The surface casing of the well is to be cemented to the surface with a single-stage cementing using Class G cement + 5% bentonite. Estimate the total number of sacks required for cement & bentonite and total time required to seal surface casing with 20% excess of the total volume of slurry.
A rectangular plate of sides 20cm and 10cm has its faces and the edge x=20 insulated. its edge y=0 and y=10 are kept at temperature zero, while the edge x=0 is kept at temperature ky. Find the steady-state temperature distance in the plate.
agent orange contains about 2 ppm (m/v) of dioxin, a very toxic substance, as an impurity. how many milliliters of agent orange would have to be used in order to place 0.01 g of dioxin in the environment
Directions. Solve the following problems. Show your solutions.
I. For the voltaic cell, 2 Na(s) + Fe2+(aq) → 2 Na+
(aq) + Fe(s)
a) Write the two half-reactions.
b) Write the cell notation.
c) Calculate E ° for the cell.
II. Consider the fission reaction 1
0n + 235
92U →
89
37Rb + 3 0
-1e + 3 1
0n + 144
58Ce
How much energy in kilojoules is released per gram of Uranium- 235?
III. For Al-28, calculate the binding energy in kilojoules /mol?
IV. Sketch a portion of the acrylonitrile polymer ( Refer to Table 23.1) assuming it is a
a) head-to-tail polymer
b) head-to-tail, tail-to-tail polymer
A material has a mass of 83 g before abrasion and the abrasive ratio is 1.75. If the area of
abrasion is 23, find the mass after abrasion.
A material has a mass of 187 g and 140 g before and after abrasion, respectively. If the material
has a circular cross-section of 5 cm diameter, find the abrasive ratio.
A material has a mass of 95 g and 68 g before and after abrasion, respectively. If the abrasive
ratio of 1.85, find the area of abrasion.
A solid brass bar 5.0 m long with rectangular cross-section, whose dimensions are 115 mm
by 188 mm is loaded in tension with a pull of 196.77 Mg. After which, it is loaded in
compression with a push of 168.59 Mg. If the load P used to bend the steel bar is the average
of the tensile and compressive load and there is bending and shear in the cross-section,
Calculate the following:
a. Compressive Strength
b. Maximum bending strength (Hint: assume length of the steel is the distance between
supporting ends)
