Chemistry, 07.10.2020 22:01 DojaCat

An atom has the following three isotopes: 24 amu (percent abundance = 78.99%)25 amu (percent abundance =10.00\%) , and 26 amu (percent bundance=11.01\%) . Calculate the average atomic mass. What is the identity of this atom based on your calculation?

Answers: 3

Show answers

Answers

Answer from: dswitz6604

1. The average atomic mass of the element is 24.32 amu

2. The identity of the atom is Magnesium (Mg)

Let the 1st isotope be A

Let the 2nd isotope be B

Let the 3rd isotope be C

From the question given above, the following data were obtained:

For Isotope A

Mass of A = 24 amu

Abundance of A (A%) = 78.99%

For Isotope B

Mass of B = 25 amu

Abundance of B (B%) = 10%

For Isotope C

Mass of C = 26 amu

Abundance of C (C%) = 11.01%

Average atomic mass =?

The average atomic mass of the atom can be obtained as follow:

Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

= [(24 × 78.99)/100] + [(25 × 10)/100] + [(26 × 11.01)/100]

= 18.9576 + 2.5 + 2.8626

= 24.32 amu

Therefore, the atomic mass of the atom is 24.32 amu.

From the periodic table, the element having atomic mass of 24.32 amu is Magnesium (Mg).

Therefore, the identity of the atom is Magnesium (Mg)

Learn more: link

Answer from: spearjj

We multiply each mass with its percentage.
24*(78.99/100) = 18.96
25*(10/100)= 2.5
26*(11.01/100)= 2.86
Then add these together.
18.96+2.5+2.86= 24.32amu
An element that has an average mass of nearly 24.32amu would be Mg (magnesium)

Answer from: Quest

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence, the electronegativity (or the ability to attract electrons) is lessened."

Answer from: Quest

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

Other questions on the subject: Chemistry

Chemistry, 22.06.2019 10:00, paynedeforest2596

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at

Answers: 1

continue

Chemistry, 22.06.2019 14:30, joejoefofana

Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀ pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4. 0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.

Answers: 3

continue

Chemistry, 22.06.2019 14:50, jonmorton159

Consider the following multistep reaction: a b→ab(slow) a ab→a2b(fast)−−−−−−−−−−−−−−−−− 2a b→a2b(overall) based on this mechanism, determine the rate law for the overall reaction. express your answer in standard masteringchemistry format. for example, if the rate law is k[a]3[b]2 type k*[a]^3*[b]^2

Answers: 3

continue

Chemistry, 22.06.2019 20:00, 20calzoy

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .

Answers: 3

continue

You know the right answer?

An atom has the following three isotopes: 24 amu (percent abundance = 78.99%)25 amu (percent abundan...