Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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- The average atomic mass of copper is 63.546 amu. It is composed of copper-63 and copper-65 isotopes. The natural abundance of copper-63 (62.9296 amu) is 69.17%. Show how the natural abundance of copper-65 (64.9278 amu) can be determined two different ways from the given information.arrow_forwardPlease do this chemistry workarrow_forward1- For each of the following atoms, calculate the number of protons and neutrons in the nucleus and the number of electrons outside the nucleus (assume neutral atoms). element number of number of number of electrons mass number (A) symbol 126C protons (Z) neutrons 12 10 12 10 14 27 10 23,1Na 11 17 18 2- Calculate the atomic mass to four significant figures for carbon, given the following data: Isotope Exact Atomic Mass (amu) 12.00000 13.00335 Abundance in Nature (%) 98.89 1.110 12C 13Carrow_forward
- Calculated the weighted average of a substance from space. It has an abundance of 30.0% and 70.0% for its two isotopes. The atomic mass for the two isotopes are 111.653amu and 113.665amu, respectively.arrow_forwardA robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the Isotopes of ruthenium in these samples: mass relative isotope (amu) abundance 100 Ru 99.90 58.% 96 Ru 95.91 42.% Use these measurements to complete the entry for ruthenium in the Periodic Table that would be used on 98765 ALEKS. Round your entry for the atomic mass to 2 significant digits. Caution: your correct answer will have the same format but not necessarily the same numbers as the entry for ruthenium in the Periodic Table we use here on Earth. Ru Submit Assignment Continue 2021 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Center Accessibility DII -> esc & 23 $4 @ 4 3 rarrow_forwardWhich of the following represents a pair of isotopes? Atomic Number | Mass Number 1. 6| 14 A II. 7| 14 1. 617 B II. 14 | 14 1. 6| 14 II. 14 | 28 I. 7 | 13 D II. 7 | 14 1. 8 10 II. 16 20arrow_forward
- Write the atomic symbols for isotopes with the following characteristics: 16 protons and 16 neutrons Express your answer as an isotope. 35 protons and 45 neutrons Express your answer as an isotope. 13 electrons and 14 neutrons Express your answer as an isotope. an iodine atom with 74 neutrons Express your answer as an isotope. a mercury atom with 122 neutrons Express your answer as an isotope.arrow_forwardCalculate the atomic mass of each of the isotopes listed below. Give your answer in grams (g). The values will include the mass of Z electrons. Use 1 u = 1.6605 X 10-24 g. 1) Calculate the atomic mass of the isotopes 1H in grams (g). The atomic mass m1H = 1.007825 u. (Express your answer to five significant figures.) 2) Calculate the atomic mass of the isotopes 4He in grams (g). The atomic mass m4He = 4.002602 u. (Express your answer to five significant figures.) 3) Calculate the atomic mass of the isotopes 12C in grams (g). The atomic mass m12C = 12.000000 u. (Express your answer to five significant figures.) 4) Calculate the atomic mass of the isotopes 56Fe in grams (g). The atomic mass m56Fe = 55.934940 u. (Express your answer to five significant figures.) 5) Calculate the atomic mass of the isotopes 238U in grams (g). The atomic mass m238U = 238.050784 u. (Express your answer to five significant figures.)arrow_forwardwhat is the atomic mass of an unidentified element that has 2 naturally occurring isotopes with the following masses and natural abundances? Isotope 1: 44.8776 amu, 32.88%isotope 2: 46.9443 amu, 67.12%arrow_forward
- A new element Z has been discovered. There are 2 isotopes of this element: Z-121 which has an atomic mass of 121.098, and Z-123 which has an atomic mass of 123.456. If the relative abundance of Z-121 34.5%, what is the average atomic mass of element Z?arrow_forwardSilicon has three naturally occurring isotopes: 92.23% of Si-28 with an atomic weight of 27.9769 amu, 4.68% of Si-29 with an atomic weight of 28.9765 amu, and 3.09% of Si-30 with an atomic weight of 29.9738 amu. Calculate the average atomic weight to 4 significant figures. (Note: The specific isotope for the element is noted as Si-#). Answer:arrow_forward
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