Answer:
the answer is B if one mol contains of NH4NO3 contains 6.02X 10^23
Answer:
132 54Xe
Explanation:
From the question given above, the following were obtained:
Proton = 54
Neutron = 78
Atomic number =?
Atomic symbol =.?
Next, we shall determine the atomic number of the isotope. This can be obtained as follow:
Atomic number of an element is simply defined as the number of protons in the atom of the element.
Thus,
Atomic number = proton number
Proton = 54
Atomic number = proton number = 54
Atomic number = 54
Therefore, the atomic number of the isotope is 54
Next, we shall determine the mass number of the isotope. This can be obtained as follow:
Proton = 54
Neutron = 78
Mass number =.?
Mass number = Proton + Neutron
Mass number = 54 + 78
Mass number = 132
Therefore, the mass number of the isotope is 132.
From the calculations made above, the isotope have:
Atomic number = 54
Mass number = 132
Comparing the atomic number with those in the periodic table, the isotope is Xenon (Xe).
Thus, the atomic symbol for the isotope is 132 54Xe.
You have to use this knwoledge:
1) The superscript number on the left of the symbol is the mass number (A)
2) The underscript number on the left of the symbol is the atomic number (Z)
3) The atomic number, Z, is the number of protons of the atom.
4) The number of electrons of an atoms is equal to the number of protons.
5) The mass number, A is equal to the number of neutrons, N, plus the number of protons, Z, i.e. A = N + Z, from which you obtain N = A - Z
Now I am going to apply above rules to solve the three cases for you.
I will use other notation just because the editor does not permit to place superscripts and underscripts on the left of the symbol.
a) 62 Cu 29 and 62 Zn 39
62 Cu 29:
Z = 29 = number of protons
A = 62 = N + Z => N = 62 - Z = 62 - 29 = 33
Number of electrons = number of protons = 29
62 Zn 39:
Z = 39 = number of protons
A = 62 = N + Z => N = 62 - Z = 62 - 39 = 23
Number of electrons = number of protons = 39
Answers:
protons are not equal
neutrons are not equal
electrons are not equal.
b) 40Ar18 and 41K19
40Ar18:
Z = 18 = number of protons
A = 40 = N + Z => N = 40 - 18 = 22 = number of neutrons
number of electrons = number of protons 18
41K19:
Z = 19 = number of protons
A = 41 = N + Z> N = 41 - 19 = 22
number of electrons = number of protons = 19
Answers:
protons are not equal
neutrons are equal
electrons are not equal
c) 14N7 and 15N7
14N7:
Z = 7 = number of protons
A = 14 => N = 14 - 7 = 7 = number of neutrons
number of elecfrons = number of protons = 7
15N7:
Z = 7 = number of protons
A = 15 => N = 15 - 7 = 8 = number of neutrons
number of electrons = number of protons = 7
Answers:
protons are equal
neutrons are not equal
electrons are equal
20 g/cm3 I got this because 120 divided by 6 is 20
Answer:
%
%
%
%
Explanation:
If we know the grams of a chemical compound in a specific reaction, it is possible to know the percentage of each atom that composes it.
For the Aluminum Oxide in this problem, we know its total weight and the grams of each component.
therefore we can determine the percentage ratio of its components through:
For Al
%
%
%
%
%
%
In the same way for oxygen
%
%
%
%
%
%