Question
In: Chemistry
Boron, atomic number 5, occurs naturally as two isotopes (10B and 11B) with natural abundances of...
Boron, atomic number 5, occurs naturally as two isotopes (10B and 11B) with natural abundances of 19.9% and 80.1% respectively. In what ways do the two isotopes differ? Do the electronic configurations differ? Draw the orbital diagram for 11B. Which electrons are the valence? Give three ways the 1s and 2s orbitals differ for this element. Elemental boron reacts withF2 gas to form BF3(g). Write balance equation for this reaction. If the delta Hf for BF3 is -1135.6 kJ/mol, find the standard enthaply change for the reaction. Draw the lewis structure for BF3.
***please write out on paper nice and neat!
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Solutions
queen_honey_blossom answered 2 years agoRelated Solutions
Boron has two naturally occurring isotopes, 10B and 11B. The ratio of the numeric abundances may...
Boron has two naturally occurring isotopes, 10B and
11B. The ratio of the numeric abundances may vary for
samples derived from diverse natural sources.
A
4.02668
E
4.02709
B
4.02553
F
4.02747
C
4.02404
G
4.02480
D
4.02417
H
4.02598
Sample E was analyzed five times giving
4.02709 and s = 0.00007.
The 99% confidence interval for sample E is:
4.02709± ???
5. calculate the atomic mass of element "X" if it has 2 naturally occurring isotopes with...
5. calculate the atomic mass of element "X" if it has
2 naturally occurring isotopes with the following masse and natural
abundances:
X-45: 44.8776 Amu 32.88%
X-47: 46.9443 Amu 67.22%
10. silver has an atomic mass of 107.868 Amu. The
Ag-109 isotope (108.905 amu) is 48.16%. what is the amu of the
other isotope?
39. calculate the mass percent composition of sulfur
in Al2(SO4)3.
41. determine the molecular formula for a compound
that is 70.79% carbon, 8.91% hydrogen, 4.59% nitrogen,...
Only two isotopes of copper occur naturally, 63Cu (atomic mass = 62.9296 amu; abundance 69.17%) and 63Cu (atomic mass = 64.9278 amu; abundance 30.83%). Calculate the atomic weight (average atomic mass) of copper.
Only two isotopes of copper occur naturally, 63Cu (atomic mass = 62.9296 amu; abundance 69.17%) and 63Cu (atomic mass = 64.9278 amu; abundance 30.83%). Calculate the atomic weight (average atomic mass) of copper.
A hypothetical element consists of two isotopes of masses 70.95 amu and 72.95 amu with abundances...
A hypothetical element consists of two isotopes of masses 70.95
amu and 72.95 amu with abundances of 30.9% and 69.1%, respectively.
What is the average atomic mass of this element?
The element technetium (atomic number 43) is radioactive and one of its isotopes, 99Tc, is used...
The element technetium (atomic number 43) is radioactive and one
of its isotopes, 99Tc, is used in medicine for diagnostic imaging.
The isotope is usually obtained in the form of the pertechnetate
anion, TcO4-, but its use sometimes requires the technetium to be
in a lower oxidation state. Reduction can be carried out using Sn2+
in an acidic solution. The skeleton equation is TcO4- + Sn2+ → Tc4+
+ Sn4+ (acidic solution) Balance the equation by the ion–electron
method.
The element technetium (atomic number 43) is radioactive and one of its isotopes, 99Tc, is used...
The element technetium (atomic number 43) is radioactive and one
of its isotopes, 99Tc, is used in medicine for diagnostic imaging.
The isotope is usually obtained in the form of the pertechnetate
anion, TcO4-, but its use sometimes requires the technetium to be
in a lower oxidation state. Reduction can be carried out using Sn2+
in an acidic solution. The skeleton equation is TcO4- + Sn2+ → Tc4+
+ Sn4+ (acidic solution) Balance the equation by the ion–electron
method.
Button type Number of buttons Mass of sample (g) Atomic mass of isotopes % Abundance 2...
Button type
Number of buttons
Mass of sample (g)
Atomic mass of isotopes
% Abundance
2 holes
25
44.64
3 holes
15
23.52
4 holes
12
15.19
To complete the last to columns, and then calculate the atomic
mass of the element Buttonium.
A) To complete the atomic mass of each isotope , obtain the
average mass of a button in each sample by dividing the mass of the
sample by the number of buttons in the sample. Show your...
What conditions must occur for two atoms to be isotopes? How is average atomic mass determined?
What conditions must occur for two atoms to be isotopes? How is
average atomic mass determined?
Consider an isotope with an atomic number of [2(5+A)] and a mass number of [4(5+A)+2]. Using...
Consider an isotope with an atomic number of [2(5+A)] and a mass
number of [4(5+A)+2]. Using the atomic masses given in the attached
table, calculate the binding energy per nucleon for this isotope.
Give your answer in MeV/nucleon and with 4 significant figures.
(A=8)
A particular radioactive isotope has a half-life of (2.50+A)
hours. If you have (24.5+B) g of the isotope at 10:00 AM, how much
will you have at 7:30 PM? Give your answer in grams (g)and with...
Silver has two stable isotopes. The nucleus, 10747Ag, has atomic mass 106.905095 g/mol with an abundance...
Silver has two stable isotopes. The nucleus, 10747Ag, has atomic
mass 106.905095 g/mol with an abundance of 51.83% ; whereas
10947Ag, has atomic mass 108.904754 g/ mol with an abundance of
48.17%. What is the binding energy per nucleon for each
isotope?
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