Answer:
The typical atomic weight of bromine is 79.9 amu.
Explanation:
Provided information:
Br⁷⁹ constitutes 55% of the sample
Br⁸¹ constitutes 45% of the sample
What is the average atomic weight of bromine?
Calculation formula:
Average atomic mass = [isotope mass × its proportion] + [isotope mass × its proportion] +...[ ] / 100
We can now insert the known values into the formula.
Average atomic mass = [55 × 79] + [81 × 45] / 100
Average atomic mass = 4345 + 3645 / 100
Average atomic mass = 7990 / 100
Average atomic mass = 79.9 amu
The typical atomic weight of bromine is 79.9 amu.
Answer:
1984
Explanation:
Utilizing the equation;
0.693/t1/2 = 2.303/t log (Ao/A)
Where;
t1/2 = half-life of the radioactive isotope
t= age of the wine
Ao= initial activity of the wine
A= activity at time = t
Substituting values, we have 0.693/12.3 = 2.303/t log (5.5/0.688)
0.693/12.3 = 2.079/t
0.056 = 2.079/t
t= 2.079/0.056
t= 37 years
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The equal mass indicates that both atoms have the same number of protons and neutrons.
A positive charge signifies a difference in electron count.
Assuming the atomic number is A,
the mass number equals M.
In a neutral atom, there are A electrons.
A negatively charged atom would have A + 1 electrons [while the count of protons and mass number remains unchanged].
A positively charged atom contains A - 1 electrons [with consistent protons and mass number].
For instance: Cl- and Cl+.
Answer:
Heat flow is best characterized as the transfer of heat between a system and its surroundings.
Explanation:
Heat is energy that moves spontaneously from a hotter object to a cooler one due to temperature differences among substances. In this scenario, heat can be said to flow from the surroundings, perhaps a hurt athlete's knee, to the ice packs.
