To what temperature does a 250.0-ml cylinder containing 0.1000 mol he need to be cooled in order for the pressure to be 253.25 k
2 answers:
Answer:
T = 76.09 K
Explanation:
<u>Given:</u>
Moles of He, n = 0.1000
Volume, V = 250.0 ml = 0.250 L
Pressure, P = 253.25 kPa
<u>To determine:</u>
Temperature, T
<u>Formula:</u>
Based on the ideal gas law: PV = nRT -----(1)
R = 0.0821 L.atm/mol-K
P = 253.25 kPa
Now, 1 kPa = 0.00987 atm
Therefore, 253.25 kPa = 2.499 atm
Based on equation (1)
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Answer:
Percentage abundance of 121 Sb is = 57.2 %
Percentage abundance of 123 Sb is = 42.8 %
Explanation:
The formula for the calculation of the average atomic mass is:
Given that:
Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.
For first isotope, 121 Sb :
% = x %
Mass = 120.9038 u
For second isotope, 123 Sb:
% = 100 - x
Mass = 122.9042 u
Given, Average Mass = 121.7601 u
Thus,
Solving for x, we get that:
x = 57.2 %
<u>Thus, percentage abundance of 121 Sb is = 57.2 % </u>
<u>percentage abundance of 123 Sb is = 100 - 57.2 % = 42.8 %</u>
Answer:
hhh
Explanation:
Pyranose is collective term for the saccharides which have chemical structure which includes six-membered ring that consists of one oxygen atom and five carbon atoms.
Furanose is collective term for carbohydrates which have chemical structure which includes five-membered ring system that consists of one oxygen atom and four carbon atoms.
Glucose exists both in pyranose and furanose form. It's structure is shown in image.
