Question
In: Physics
Helium has a mass of 4 atomic mass units and is the second lightest element after...
Helium has a mass of 4 atomic mass units and is the second lightest element after hydrogen.
(i) Calculate the most probable speed of a helium atom in a gas at 295K.
(ii) Sketch the Maxwell speed distributions of a helium gas and an argon gas at the same temperature.
Solutions
genius_generous answered 1 year agoRelated Solutions
Helium is the lightest noble gas and the second most abundant element (after hydrogen) in the...
Helium is the lightest noble gas and the second most abundant
element (after hydrogen) in the universe.
a. The radius of a helium atom is 3.1 x 10^-11 m; the radius
of its nucleus is 2.5 x10^-15 m. What precent of the atomic volume
is occupied by the nucleus?
b.the mass of helium -4 atom is 6.64648 x 10^-24g, and each of
its two electrons has a mass of 9.10939 x 10^-28g. What present of
this atoms mass is contributed...
If an element has an atomic number of 7 and an atomic mass number of 15,...
If an element has an atomic number of 7 and an atomic mass
number of 15, how many protons, neutrons, and electrons does it
possess?
a) 7 protons, 8 neutrons, and 7 electrons
b) 7 protons, 8 neutrons, and 8 electrons
c) 8 protons, 7 neutrons, and 8 electrons
d) 15 protons, 8 neutrons, and 8 electrons
Helium (He) has an Atomic Number Z=2 and an atomic mass of 4.002602. It has eight...
Helium (He) has an Atomic Number Z=2 and an atomic mass of
4.002602. It has eight isotopes. One of them is 9He
(atomic mass number 9).
a) How many protons are in a neutral 9He atom?
b) How many nucleons (that is protons and neutrons)
are in a neutral 9He atom?
c) How many electrons are in a neutral 9He atom?
d) How many neutrons are in a neutral 9He atom?
Helium (He) has an Atomic Number Z=2 and an atomic mass of 4.002602. It has eight...
Helium (He) has an Atomic Number Z=2 and an atomic mass of
4.002602. It has eight isotopes. One of them is 6He
(atomic mass number 6).
a) How many protons are in a neutral 6He atom?
b) How many nucleons (that is protons and neutrons)
are in a neutral 6He atom?
c) How many electrons are in a neutral 6He atom?
d) How many neutrons are in a neutral 6He atom?
A hypothetical element Ec has an atomic number of 156 and an atomic mass of 300....
A hypothetical element Ec has an atomic number of 156 and an
atomic mass of 300.
1. How many neutrons and electrons would be found in a neutral
Ec atom?
2. If one proton were removed from Ec, would it still be the
same element?
3. If one electron were to be gained by an atom of Ec, would
it still be the same element? Would anything change about the
element?
Element “X” has an atomic number of 16 and an atomic mass of 40 How many...
Element “X” has an atomic number of 16 and an atomic mass of 40
How many electrons are in the valence of Element X?
Name the element with atomic number (Z) = 15 and atomic mass number = 31, Use...
Name the element with atomic number (Z) = 15 and atomic mass
number = 31, Use the symbol, not the word.
How many electrons does the neutral atom of this element have?
Use a number, not a word.
How many neutrons does the neutral atom of this element have?
Use a number, not a word.
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,...
The atomic mass of the stabile isotope of an element can be calculated by adding together...
The atomic mass of the stabile isotope of an element can be
calculated by adding together the number of __________ in an atom
of that element. A) protons and neutrons B) energy levels C)
protons and electrons D) neutrons and electrons E) isotopes
In my text book it states: The relative atomic mass of an element is the average...
In my text book it states: The relative atomic mass of an
element is the average mass of an atom of the element, taking into
account all its isotopes and their relative abundance, compared to
one atom of carbon 12. At the same time it states that generally,
the relative atomic mass is the mass of one mole of atoms of an
element. So is it the mass of one moles of atoms of an element or
the average mass...
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