An experimental determination of the percent abundances of the three isotopes ofmagnesium is given below. Based on these values what is the average mass of amagnesium atom? Show Work!IsotopeMg-24Mg-25Mg-26Mass%Abundance23.9874.624.98????2436725.9813.3

Answered: An experimental determination of the…

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter4: The Structure Of The Atom

Section: Chapter Questions

Problem 14STP

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An element consists of 1.40% of an isotope with mass 203.973 u, 24.10% of an isotope with mass 205.9745 u, 22.10% of an isotope with mass 206.9759 u, and 52.40% of an isotope with mass 207.Y766 u. Calculate the average atomic mass, and identify the element.
Verify that the atomic weight of magnesium is 24.31, given the following information: 24Mg, mass = 23.985042 u; percent abundance = 78.99% 25Mg, mass = 24.985837 u; percent abundance = 10.00% 26Mg, mass = 25.982593 u; percent abundance = 11.01%
A gaseous binary compound has a vapor density that is 2.53 times that of nitrogen at 100°C and atmospheric pressure. When 8.21 g of the gas reacts with AlCl3 at 100°C, 1.62 g gaseous nitrogen is produced, removing all of the nitrogen originally present. (a) Estimate the molecular mass of the gaseous compound. (b) How many nitrogen atoms are there in a molecule of the compound? (c) What is the maximum possible value of the atomic mass of the second element? (d) Are other values possible for the atomic mass of the second element? Use a table of atomic masses to identify the element that best fits the data. (e) What is the molecular formula of the compound?
A mass spectrometer determines isotopic masses to eight or nine significant digits. What limits the atomic mass of carbon to only five significant digits?
How would you expect the chemical properties of isotopes of the same element to compare to each other? Explain your answer.
An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99 amu, and 8.82% abundance with 21.99 amu. Calculate the average atomic mass of this element.
The average atomic masses of some elements may vary, depending upon the sources of their ores. Naturally occurring boron consists of two isotopes with accurately known masses ( 10B, 10.0129 amu and 11B, 11.0931 amu). The actual atomic mass of boron can vary from 10.807 to 10.8 19, depending on whether the mineral source is from Turkey or the United States. Calculate the percent abundances leading to the two values of the average atomic masses of boron from these two countries.
Which of the following are isotopes of element X, the atomic number for which is 9: 919X, 920X, 189X, and 921X?
Average atomic masses listed by JUPAC are based on a study of experimental results. Bromine has two isotopes 79Br and 81Br, whose masses (78.9 183 and 80.9 163 amu) and abundances (50.69% and 49.3 1%) were determined in earlier experiments. Calculate the average atomic mass of bromine based on these experiments.
Bromine has two occuring isotopes: 79Br with atomic mass 78.9183 and 81Br with atomic mass 80.9163. Without using a calculator, what would you estimate the % abundance of Br-79 to be?
Element XYZ has two isotopes: XYZ-79 (mass =69.9943 amu) and XYZ-81 (mass=80.9893 amu). If the relative percent abundancy of XYZ-79 is 50.6865% while XYZ-81 is 49.3135%, calculate for the average molar mass of XYZ. Express your answer in 3 significant figures.
Atomic weights are not provided, but please use rounded-off values to the nearest whole number.(examples: 24.305, use "24"; 107.8682, use "108"; 1.00784, use "1"; 15.999, use "16") Add trailing zeros to complete your answer to the 3rd decimal place, if necessary. (examples: if your answer is "62.7", write it as 62.700; if your answer is "37.12", write it as 37.120if your answer is "123", write it as 123.000) 1. A 3.50-gram sample of Streptomycin powder was tested for its water content. If the water equivalence factor of the KF reagent was 4.6, what is the percentage water content of the sample if 9.2 ml of the KF reagent was used? 2. An analyst accurately weighed 5.351 grams of sample for ash-insoluble content using the dry method. The weight of the crucible containing the ash was 40.722 grams. If the sample was said to have 2.150% of insoluble ash, what is the weight of the tared crucible?

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An experimental determination of the percent abundances of the three isotopes of magnesium is given below. Based on these values what is the average mass of a magnesium atom? Show Work! Isotope Mg-24 Mg-25 Mg-26 Mass %Abundance 23.98 74.6 24.98 ???? 24367 25.98 13.3