Worksheet 3: Chapter 4
1) Neon has 3 different isotopes, neon-20, neon-21, and neon-22. The first isotope has a mass of 19.992 amu and an abundance of 90.60%. The second isotope (neon-21) has an abundance of 0.21%. The third isotope has a mass of 21.991 amu and an abundance of 9.20%. What is the mass of the second isotope?
2) A certain element has the 4 isotopes. Given the following data, calculate the average atomic mass of the element and identify which element it is.
|
Isotope |
% abundance |
Mass ( amu) |
|
1 |
5.80% |
53.9396 |
|
2 |
91.72% |
55.9350 |
|
3 |
2.20% |
56.9354 |
|
4 |
0.28% |
57.9333 |
3) Rubidium-85 and rubidium-87 are the only two isotopes of that element. Rubidium-85 has a mass of 84.912 amu and accounts for 72.17% of all rubidium. Calculate the mass of rubidium-87.
4) Chromium has four isotopes. Chromium-50 (mass of 49.946 amu and 4.35% abundance), chromium-52 (mass of 51.941 amu and 83.79% abundance), chromium-53 (mass of 52.941 amu and 9.50% abundance), and chromium-54 (mass of 53.939 amu and 2.36% abundance). Calculate the average atomic mass of chromium.
5) Chapter 4 #’s 9-13 all, 17, 19, 20 and 42 page 85b – 85d under the Questions and Problems section.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.
Read moreEach paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.
Read moreThanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.
Read moreYour email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.
Read moreBy sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.
Read more
Recent Comments