Explanation:
Let us assume that the ratio for the given reaction is 1:1.
Therefore, we will calculate the moles of as follows.
Moles of solution = molarity × volume (L)
= 0.0440 M × 0.014 L
= 0.000616 moles
Moles of excess EDTA = 0.000616 moles
Also, the initial moles of EDTA will be calculated as follows.
Total initial moles of EDTA = 0.0600 M × 0.025 L
= 0.0015
Therefore, moles of EDTA reacted with will be as follows.
= 0.0015 - 0.000616
= 0.00088 moles
Since, we have supposed a 1 : 1 ratio between and EDTA
.
So, moles of = 0.00088 moles
Now, we will calculate the molarity of as follows.
Molarity of solution =
=
= 0.015 M
Thus, we can conclude that the original concentration of the solution is 0.015 M.
<u>Answer:</u> The average atomic mass of copper is 63.546 amu
<u>Explanation:</u>
Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.
Formula used to calculate average atomic mass follows:
.....(1)
- <u>For isotope 1 (Cu-63):</u>
Mass of isotope 1 = 62.93 amu
Percentage abundance of isotope 1 = 69.2 %
Fractional abundance of isotope 1 = 0.692
- <u>For isotope 2 (Cu-65):</u>
Mass of isotope 2 = 64.93 amu
Percentage abundance of isotope 2 = 30.8 %
Fractional abundance of isotope 2 = 0.308
Putting values in equation 1, we get:
Hence, the average atomic mass of copper is 63.546 amu
<span>In general, potential energy refers to stored energy. That is, potential energy is energy that is stored and can be changed into other forms of energy as the potential energy is released.
Gravitational potential energy is energy that is stored by a system and it comes from an object's height above the ground. Normally gravitational potential energy is changed into kinetic energy. That is, as an object falls toward the ground, the gravitational potential energy is changed into kinetic energy.
It is easy to see that the amount of gravitational potential energy increases as the height h above the ground increases. Indeed, there is a directly proportional relationship between the height h and the gravitational potential energy.
The equation for gravitational potential energy is:
GPE = mgh, where m is the mass of the object, g is the acceleration due to gravity (9.80 m/s^2), and h is the height above the ground.</span>