The first statement (Matter is neither created nor destroyed) is correct.
The second statement would violate the law of conservation of mass (I will refer to this as LCM), as it would mean matter can "flow" into the universe, but not out, meaning the total matter will never be less than it was before.
The third statement violates LCM because it means matter is created during a reaction, which is not true.
The last statement violates LCM because it means matter is lost during a reaction, which is not true.
<u>Answer:</u> The average atomic mass of copper is 63.55 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:</u>
Mass of isotope = 62.94 amu
Percentage abundance of = 69.17 %
Fractional abundance of isotope = 0.6917
- <u>For
isotope:</u>
Mass of isotope = 64.93 amu
Percentage abundance of = 30.83 %
Fractional abundance of isotope = 0.3083
Putting values in equation 1, we get:
![\text{Average atomic mass of Copper}=[(62.94\times 0.6917)+(64.93\times 0.3083)]\\\\\text{Average atomic mass of copper}=63.55amu](https://tex.z-dn.net/?f=%5Ctext%7BAverage%20atomic%20mass%20of%20Copper%7D%3D%5B%2862.94%5Ctimes%200.6917%29%2B%2864.93%5Ctimes%200.3083%29%5D%5C%5C%5C%5C%5Ctext%7BAverage%20atomic%20mass%20of%20copper%7D%3D63.55amu)
Hence, the average atomic mass of copper is 63.55 amu.
Answer:
They both have letters and different formulas to find the answer.
Explanation:
Answer:
12426torr
Explanation:
The following data were obtained from the question:
n = 0.63 mole
V = 750mL = 750/1000 = 0.75L
T = -35.6°C = -35.6 + 273 = 237.4K
R =0.082atm.L/Kmol
P =?
Using the ideal gas equation PV = nRT, the pressure can be obtained as follows:
PV = nRT
P = nRT/V
P = (0.63 x 0.082 x 237.4)/0.75
P = 16.35atm
Now let us convert this pressure (i.e 16.35atm) to a pressure in torr. This is illustrated below:
1atm = 760torr
16.35atm = 16.35 x 760 = 12426torr
Therefore, the pressure of the gas is 12426torr
A. The atmosphere
All the other examples are either elements or compounds, not mixtures. A mixture is a combination of elements that are not chemically or irreversibly conjoined so the atmosphere, made up of a variety of gases, would be a mixture.
