Answer:
265.2amu
Explanation:
Given parameters:
Atomic mass = 254.9amu
Abundance of isotope 1 = 72%
Atomic mass of isotope 1 = 250.9amu
Abundance of isotope 2 = 100 - 72 = 28%
Unknown:
Atomic mass of isotope 2 = ?
Solution:
To find the atomic mass of isotope 2, use the expression below:
Atomic mass = (abundance of isotope 1 x atomic mass of isotope 1) + (abundance of isotope 2 x atomic mass of isotope 2)
Now insert the parameters and find the unknown;
254.9 = (0.72 x 250.9) + (0.28 x Atomic mass of isotope 2)
254.9 = 180.648 + 0.28x atomic mass of isotope 2
254.9 - 180.648 = 0.28x atomic mass of isotope 2
74.25 = 0.28 x atomic mass of isotope 2
Atomic mass of isotope 2 = 265.2amu
Answer:
Terms in this set (13)
Hydroxide. OH.
Nitrate. NO3.
Ammonium. NH4.
Bicarbonate/Hydrogen Carbonate. HCO3.
Bisulphate. HSO4.
Chlorate. ClO3.
<h2>hope it's correct</h2>
Answer:
Explanation:
When adding or subtracting values, you must round your answer to the same "place" as the measurement with its last significant figure furthest to the left.
That is, you round off to the same number of decimal places as the measurement with the fewest decimal places.
The measurement of 28.1 cm has one digit after the decimal point, so you round the sum to have only one digit to the right of the decimal.
However, the number to be dropped (51) is greater than 5 with only zeros or nothing following the 5.
You must round up the answer. You increase the last significant digit by one.
Answer:
Acetic acid is a weak monoprotic acid.
In aqueous solution it has a pKa value of 4.76.
It conjugate base is acetate (CH3COO-) A 1.0m
solution ( about the concentration of domestic vinegar) has pH of 2.4, *indicating that merely
0.4% of the acetic acid molecules are dissociated.
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The Ksp of the solution is 3.2 * 10^-8.
<h3>What is Ksp?</h3>
The Ksp is called the solubility product . We know it to be the equilibrium constant that shows the extent to which a substance is dissolved in solution.
Now given that;
CaF2(s) ⇔ Ca^2+(aq) + 2F^-(aq)
Ksp = [ Ca^2+] [F^-]^2
Ksp = [0.002] [0.004]^2
Ksp = 3.2 * 10^-8
Learn more about Ksp:brainly.com/question/27132799
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