Chemistry: Principles and Reactions
8th Edition
ISBN: 9781305079373
Author: William L. Masterton, Cecile N. Hurley
Publisher: Cengage Learning
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Textbook Question
Chapter 2, Problem 74QAP
Which of the following statements is/are always true? Never true? Usually true?
(a) Compounds containing chlorine can be either molecular or ionic.
(b) An ionic compound always has at least one metal.
(c) When an element in a molecule has a "di" prefix, it means that the element has a +2 charge.
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(a) In the certain hydrated salt MSO3⋅4H2O, the mass percentage of H2O is 44.71%. Identify the element M in the salt?
(b) A certain element has two naturally occurring isotopes. The mass of one of the isotopes is 120.904 amu and its natural abundance is 57.21%. The mass of the second isotope is 122.904 amu.
Calculate the average atomic mass
Write the chemical symbols of the isotopes
(a) In the certain hydrated salt MSO3⋅4H2O, the mass percentage of H2O is 44.71%. Identify the element M in the salt?
(5 marks)
(b) A certain element has two naturally occurring isotopes. (5 marks) The mass of one of the isotopes is 120.904 amu and its natural abundance is 57.21%. The mass of the second isotope is 122.904 amu.
Calculate the average atomic mass
Write the chemical symbols of the isotopes
The seven most abundant ions in seawater make up morethan 99% by mass of the dissolved compounds. They are listedin units of mg ion/kg seawater: chloride 18,980; sodium 10,560;sulfate 2650; magnesium 1270; calcium 400; potassium 380;hydrogen carbonate 140.(a) What is the mass % of each ion in seawater?(b) What percent of the total mass of ions is sodium ion?(c) How does the total mass % of alkaline earth metal ions com-pare with the total mass % of alkali metal ions?(d) Which makes up the larger mass fraction of dissolved com-ponents, anions or cations?
Chapter 2 Solutions
Chemistry: Principles and Reactions
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