# Calculate the average atomic mass of lithium which occurs as two isotopes that have the following

• (a) Use this spectrum to calculate the relative atomic mass of this sample of krypton.Give your answer to one decimal place. Explain why the value you have calculated is slightly different from the relative atomic mass given in the Periodic Table.
• The mass of the elements is usually given in atomic mass units (u). 1u -271.6605u10 kg Nuclei that contain the same number of protons but a different number of neutrons are called isotopes. For example, boron exists in nature as two stable isotopes: 10B B 5 11 5 Most boron atoms have 6 neutrons (81.1%), but some (18.9%) have only 5 neutrons.
• You can calculate the average atomic mass of an element if you know the percentage of each isotope in the element. Lithium (Li) contains 7.5% Li-6 and 92.5% Li-7. What is the average atomic mass of Li? a. Divide each percentage by 100 to change to decimal form. 7.5%____ 100 = 0.075 92.5%_____ 100 = 0.925 b. Multiply the mass of each isotope by its decimal percentage. 6 × 0.075 = 0.45 7 × 0.925 = 6.475 c. Add the values together to get the average atomic mass. 0.45 + 6.475 = 6.93 5. Use ...
• 2. Calculate the average atomic mass of lithium, which occurs as two isotopes that have the following atomic masses and abundances in nature: 6.017 u, 7.30% and 7.018 u, 92.70%. 3. 2Hydrogen is 99% 1H, 0.8% H, and 0.2% 3H. Calculate its average atomic mass. 4. Calculate the average atomic mass of magnesium using the following data for three
• When data are available regarding the natural abundance of various isotopes of an element, it is simple to calculate the average atomic mass. For helium, there is approximately one isotope of Helium-3 for every million isotopes of Helium-4; therefore, the average atomic mass is very close to 4 amu (4.002602 amu).
• and 31% copper-65. Explain why the average atomic mass listed on the periodic table for copper is 63.55. Solution a. Copper’s atomic number is 29, so both isotope symbols have a subscript 29 indicating 29 protons. b. The two isotopes have different atomic masses. Both isotopes have 29 protons, so copper-63 has 34 neutrons and copper-65 has 36 ...
• The periodic table tells us that the average atomic mass for lithium is about 6.94 amu. Li-6 … 6.015 amu … 7.59% relative abundance Li-7 … 7.016 amu … 92.41% relative abundance 0.0759 (6.015) + 0.9241 (7.016) = 6.940 amu
• Atomic Mass Lithium has only two naturally occurring isotopes The mass of lithium-6 is 6.01512 amu and the mass of lithium-7 is 7.01601 amu Use the atomic mass of lithium to calculate abundances...
• Calculate the average atomic mass of lithium, which occurs as two isotopes that have the following atomic masses and abundances in nature: 6.017 u, 7.30% and 7.018 u, 92.70%. 5. Hydrogen is 99% 31H, 0.8% 2H, and 0.2% H. Calculate its average atomic mass.
• Calculate the average atomic mass of iodine. Calculate the average atomic mass of gold with the 50% being gold-197 and 50% being gold-198. Calculate the average atomic mass of lithium, which occurs as two isotopes that have the following atomic masses and abundances in nature: 6.017 u, 7.30% and 7.018 u, 92.70%.
• 1) Calculate the average atomic mass of lithium to the nearest thousandth, which occurs as two isotopes that have the following atomic masses and abundances in nature: 7.30% at 6.017 amu, and 92.70% at 7.018 amu. (6.945amu) 2) Calculate the average atomic mass of magnesium using the following data for three magnesium isotopes to 3 decimal places.
• Atomic Mass Formula Questions: 1. Calculate the atomic mass of chlorine using the information provided in the following table. Answer: To find the atomic mass of chlorine, the atomic mass of each isotope is multiplied by the relative abundance (the percent abundance in decimal form) and then the individual masses are added together.
• products. Because 75.78% = 0.7578 and 24.22% = 0.2422, we have This answer makes sense: The atomic weight, which is actually the average atomic mass, is between the masses of the two isotopes and is closer to the value of 35Cl, the more abundant isotope. Practice Exercise 1 There are two stable isotopes of copper found in nature, 63Cu and 65Cu ...
• Mar 16, 2015 · Average Atomic Mass of Lithium • 6 Li = 6.015 amu at 0.0742 fractional abundance • 7 Li = 7.016 amu at 0.9258 fractional abundance • Average atomic mass of lithium mLi = (0.0742 × 6.015 amu + 0.9258 × 7.016 amu) = 6.942 amu This value is within the computational uncertainty of the value listed in the period table (see next slide).
• The atomic masses of its two stable isotopes, (69.09 percent) and (30.91 percent), are 62.93 amu and 64.9278 amu, respectively. Calculate the average atomic mass of copper. The relative abundances are given in parentheses.
• The natural abundance for boron isotopes is 19.9% 10B (10.013 amu*) and 80.1% 11B (11.009 amu*). Calculate the atomic mass of boron. Average atomic mass = [(19.9%)(10.013)] + [(80.1%)(11.009)] 100 = 10.811 (note that this is the value of atomic mass given on the periodic table) *amu is the atomic mass unit (u, μ or amu), which is defined as 1 ...
• The problem may be reversed by asking you to calculate percentage abundance by providing other values such as isotope mass and average atomic mass. For elements having two isotopes, you have to use x and 100-x (or 1-x) in the formula for percentage composition of isotope1 and isotope2 respectively.
• Average Atomic Mass. Because carbon exists in several isotopes, the atomic mass of an “average” carbon atom is neither 12.0 nor 13.00335. Instead it is 12.011, a value that is closer to 12. 0 because 98.90% of all carbon atoms are carbon-12. As shown in the following example, if you know the percent abundance and atomic masses of an element ...
Install pycairo ubuntuIn other words, in every 100 chlorine atoms, 75 atoms have a mass number of 35, and 25 atoms have a mass number of 37. To calculate the relative atomic mass, A r , of chlorine: Average Atomic Mass Example: A sample of naturally occurring gallium has an average atomic mass of 69.7 and consists of two isotopes, gallium-69 and gallium-71. Given the information shown below, calculate the % isotopic abundances of the two isotopes. Isotope Atomic Mass 69 Ga 68.9 amu 71 Ga 70.9 amu
Sep 03, 2017 · What is the average atomic mass of titanium? 6 6 6 2. 6. Calculate the atomic mass of copper if copper-63 is 69.17% abundant and copper-65 is 30.83% abundant. 7. Boron exists in two isotopes, boron-10 and boron-11. Based on the atomic mass, which isotope should be more abundant? 8. Lithium-6 is 4% abundant and lithium-7 is 96% abundant.
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• 1. There are three known isotopes of silicon. 92.21% is 28Si atomic mass = 27.963; 4.70% is 29Si atomic mass = 28.97659; and 3.09% is 30Si atomic mass = 29.97376. Calculate an average atomic mass for silicon. 2. Magnesium, Mg, has the following isotopic masses and fractional abundances Mass Number Mass Fractional Abundance 24 23.985 0.7870 6. Copper has an atomic mass of 63.5456 amu and has two stable isotopes. Copper-63 has a mass of 62.9296 amu, and copper-65 has a mass of 64.9278 amu. (a) Calculate the percent abundance of each isotope of copper. (b) Sketch the expected mass spectrum of the copper.
• Atomic mass = (rel. abundance isotope 1 × mass isotope 1) + (rel. abundance isotope 2 × mass isotope2) + (rel. abundance isotope 3 × mass isotope 3) Trial 1: Atomic mass = (0.260× 0.296 g) + (0.384× 0.557 g) + (0.356× 1.089 g) = 0.679 g Trial 2: Atomic mass = (0.222× 0.295 g) + (0.403× 0.562 g) + (0.375× 1.091 g) = 0.701 g ××× ™ ™ Average or
• TOPIC 3.3 - ISOTOPES AND AVERAGE ATOMIC MASS Isotopic Notation Mass number (protons + neutrons) Atomic number (# of protons) carbon — Name of element (can get atomic # from P. T.) 12 Mass number (protons + neutrons) > MASS NUMBER IS NOT SAME AS THE ATOMIC MASS! o Atomic mass is the number listed on the Periodic Table above the element's symbol

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Example #6: A sample of element X contains 100 atoms with a mass of 12.00 and 10 atoms with a mass of 14.00. Calculate the average atomic mass (in amu) of element X. Solution: 1) Calculate the percent abundance for each isotope: X-12: 100/110 = 0.909
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Relative Atomic Mass A r Most elements contain a mixture of isotopes, each with a different mass. The relative atomic mass is the weighted mean mass of an atom of an element when compare to 1/12 of the mass of an atom of C-12 The ‘weighted mean mass’ is an average which takes into account: the percentage abundance of each isotope,
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Calculate the average atomic mass of lithium, which occurs as two isotopes that have the following atomic masses and abundances in nature: 6.017 amu, 7.30% and 7.018 amu, 92.70%.
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79.904 amu. Variations in average atomic mass may be observed for elements obtained from different sources. Lithium provides an example of this. The isotopic composition of lithium from naturally occurring minerals is 7.5% 6 Li and 92.5% 7 Li, which have masses of 6.01512 amu and 7.01600 amu, respectively.
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B)more isotopes have an atomic mass of 2 or 3 than of 1 C)more isotopes have an atomic mass of 1 than of 2 or 3 D)isotopes have only an atomic mass of 1 33.Hydrogen has three isotopes with mass numbers of 1, 2, and 3 and has an average atomic mass of 1.00794 amu. This information indicates that A)atomic number B)atomic mass C)half-life D)molar ...
• Sep 25, 2017 · 12.The table below gives the atomic mass and the abundance of the two naturally occurring isotopes of chlorine. Which numerical setup can be used to calculate the atomic mass of the element chlorine? A)31% A-63 and 69% A-65 B)50% A-63 and 50% A-65 C)69% A-63 and 31% A-65 D)100% A-63 and 0% A-65 13.The atomic mass of element A is 63.6 atomic ...
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• and 31% copper-65. Explain why the average atomic mass listed on the periodic table for copper is 63.55. Solution a. Copper’s atomic number is 29, so both isotope symbols have a subscript 29 indicating 29 protons. b. The two isotopes have different atomic masses. Both isotopes have 29 protons, so copper-63 has 34 neutrons and copper-65 has 36 ...
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• 9. The average atomic mass of an element can be estimated from data on a mass spectrum. a. Calculate the average atomic mass of magnesium using data from Model 2. Hint: You will not get the correct answer if you add 24, 25 and 2Q and divide by 3. b. Give two reasons why your calculated value in part a is only an estimate of the average atomic ...
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• 1. Lithium, which has an atomic mass of 6.9408 amu, has two naturally occurring isotopes, Li-6 and Li-7. Which isotope occurs in greater abundance? 2. Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37. The average atomic mass of chlorine is 35.453 amu. Which isotope occurs in greater abundance? 3.
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• mass number group isotopes atomic mass unit (amu) atomic mass period Part D Questions and Problems Solve the following problem in the space provided 24. Given the relative abundance of the following naturally occurring isotopes of oxygen, calculate the average atomic mass of oxygen. 88 oxygen-16: 99.76% 0.037% oxygen-17: 0.204% oxygen-18:
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