Silicon has three naturally occurring isotopes: Si-28 has a percent abundance of 92.23% and a mass of 27.977 amu, Si-29 that has a 4.68% abundance and a mass of 28.976 amu, and Si-30 that has a 3.09% abundance and a mass of 29.974 amu. Calculate the atomic mass for silicon using the weighted average mass method.

Question
Asked Sep 24, 2019

Silicon has three naturally occurring isotopes: Si-28 has a percent abundance of 92.23% and a mass of 27.977 amu, Si-29 that has a 4.68% abundance and a mass of 28.976 amu, and Si-30 that has a 3.09% abundance and a mass of 29.974 amu. Calculate the atomic mass for silicon using the weighted average mass method.

check_circle

Expert Answer

Step 1

The average atomic mass of silicon isotopes can be calculated as

Isotope = Si-28

amu =27.9769

Abundance (%) =92.18

Isotope = Si-29

amu =28.9765


Abundance (%) =4.71

Isotope =Si-30

amu =29.9738

Abundance (%) =3.12

Step 2

Multiple the amu by the percentage of occurrence to arrive at an average atomic mass

27.977 × 0.9223 + 28.976 × 0.0468+29.974×.0309

25.8031 + 1.3560 + 0.9261= 28.0852

...

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: Uranium decays by first order kinetics. Given that the half-life of uranium is 4.47 billion years, w...

A: Given,Order of uranium decay = 1st orderHalf-life of uranium (t1/2) = 4.47 billion yearsInitial mass...

question_answer

Q: Predict the electron configuration of each of the following atoms: C Ca2+ N

A: According to Aufbau principle, the electrons fill their atomic orbitals in the increasing order of e...

question_answer

Q: Suppose that data relating the rate constant and temperature results in a line the slope for the lin...

A: The activation energy for the reaction with given line graph is determined by using equation -Ea= sl...

question_answer

Q: A student performed a calorimetry experiment to determine the specific heat ofaluminum metal. She di...

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and s...

question_answer

Q: Suppose you accidentally drop a glass bowl full of sugar onto the floor, causing the bowl to shatter...

A: Given that a glass bowl full of sugar was drop onto the floor and was shattered into pieces. Differe...

question_answer

Q: A solution that is 20% salt is mixed with a solution that is 30% salt. Which of the following are no...

A: When we mix the solution of 20% salt and the solution of  30% salt,  the resulting solution consists...

question_answer

Q: please answer the questions in the images (part of the same question) thank you

A: The Hund’s rule state that the pairing of electrons in orbitals does not occur until all orbitals ar...

question_answer

Q: An alloy of Sn, Pb, and Cd has a mole ratio of Sn to Pb of 2.73:1.00, and the mass ratio of Pb to Cd...

A: Given,An alloy of Sn, Pb, and Cd has a mole ratio of Sn to Pb of 2.73:1.00, and the mass ratio of Pb...

question_answer

Q: For selected molecule identify: a) all the symmetry elements present b) appropriate point group c) w...

A: (a)The point of reference from which the symmetry operations take place is known as symmetry element...