Answer:
The percent isotopic abundance of Cu-65 is 30.79 %.
The percent isotopic abundance of Cu-63 is 69.21 %.
Explanation:
we know there are two naturally occurring isotopes of carbon, Cu-63 (62.9298 amu) and Cu-65 (64.9278 amu)
First of all we will set the fraction for both isotopes
X for the isotopes having mass 62.9298 amu
1-x for isotopes having mass 64.9278 amu
The average atomic mass of copper is 63.546 amu.
we will use the following equation,
62.9298 x + 64.9278 (1-x) = 63.546
62.9298x + 64.9278 - 64.9278x = 63.546
62.9298x - 64.9278x = 63.546 - 64.9278
-1.998 x = -1.3828
x=-1.3828 / -1.998
x= 0.6921
0.6921 × 100 = 69.21 %
69.21 % is abundance of Cu-63 because we solve the fraction x.
now we will calculate the abundance of Cu-65.
(1-x)
1-0.6921 = 0.3079
0.3079 × 100 = 30.79 %
30.79 % for Cu-65.
5 times dilution
0.780M x 1/5 = 0.156M
Hope this help.
When a nucleus emits a positron, its atomic number is lowered by one but its mass number stays the same.
5604000gallon =21239160 liters
An example of a structure that contains amide is the nylon, paracetamol, and dimethylformamide.
<h3>What is an amide?</h3>
An amide is defined as the organic chemical compound which is a functional group that contains carbonyl group bonded to a nitrogen or any compound containing this functional group.
Typical examples of compounds that contains an amide group include the following:
- Nylon: This is a chemical compound that contains synthetic copolymer composed of secondary amides separated by two or more methylene groups.
- paracetamol, and
- dimethylformamide.
Learn more about nylon here:
brainly.com/question/25835424
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