practice 2 - one with a mass number of 79. The atomic...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CH301 Isotope Calculation Extra Practice Problems 1. There are three isotopes of magnesium. The percent abundance for each isotope is given below: Mg-24 78.70% Mg-25 10.13% Mg-26 11.17% Calculate the expected atomic weight of magnesium. How does this calculated value compare to the value on the periodic table? What are some reasons for any differences? 2. Boron has two isotopes. Calculate the atomic mass of boron given the information below. B-10 10.013 amu 19.6% B-11 11.009 amu 3. Lithium has two main isotopes: Li-6 and Li-7. Find the percent abundance of each isotope. 4. A hypothetical element X has two main isotopes, one with a mass number of 50 and one with a mass number of 52. The atomic weight reported on the periodic table for this element is 51.24. What is the percent abundance of each isotope? 5. A hypothetical element X has two main isotopes, one with a mass number of 76 and
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: one with a mass number of 79. The atomic weight reported on the periodic table for this element is 76.7. What is the percent abundance of each isotope? 6. Neon has three isotopes. Two of these are shown below with their percent abundance. Ne-20 90.92% Ne-22 8.82% What is the mass of the third isotope of neon? CH301 Isotope Calculation Extra Practice Problems Answers 1. 24.3247 amu Close, but not exactly same as periodic table value Possible reasons: Each isotope probably has a slightly different mass than our estimates of 24, 25, and 26 amu. The percentages used for the periodic table value were probably more precise. 2. B-11 80.4% 10.814 amu 3. Li-6 5.9% Li-7 94.1% 4. X-50 38% X-52 62% Yes – should be more of the X-52 based on the known atomic weight 5. X-76 76.7% X-79 23.3% 6. 21.27 amu...
View Full Document

This note was uploaded on 09/09/2009 for the course CH 302 taught by Professor Mccord during the Spring '09 term at University of Texas-Tyler.

Page1 / 2

practice 2 - one with a mass number of 79. The atomic...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online