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Chapter 2: Q.23E (page 67)

Average atomic masses listed by IUPAC are based on a study of experimental results. Bromine has two isotopes 79Br and 81Br, whose masses (78.9183 and 80.9163 amu) and abundance (50.69% and 49.31%) were determined in earlier experiments. Calculate the average atomic mass of bromine based on these experiments.

Short Answer

Expert verified

Bromine average mass = (0.5069×78.9183) +(0.4931×80.9163)

Avg. atomic mass = (40.003+39.899) amu

= 79.90 amu

Step by step solution

01

– Determine the above solution

50.60% =\(\frac{{50.60}}{{100}} = 0.5069\)

49.31% = \(\frac{{49.31}}{{100}} = 0.4931\)

02

– Determine the Formula of Average mass

Average mass =\(\sum\limits_i {{{(fractional\,\,abundance \times isotopic\,mass)}_i}} \)

Bromine average mass = (0.5069×78.9183)+(0.4931×80.9163)

Avg. atomic mass= (40.003+39.899) amu

= 79.90 amu

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Most popular questions from this chapter

Question : Write the formulas of the following compounds:

(a) lithium carbonate

(b) sodium perchlorate

(c) barium hydroxide

(d) ammonium carbonate

(e) sulfuric acid

(f) calcium acetate

(g) magnesium phosphate

(h) sodium sulfite

Use the Build a Molecule simulation (http://openstaxcollege.org/l/16molbuilding) to repeat Exercise 2.34, but build a molecule with two carbons, six hydrogens, and one oxygen.(a) Draw the structural formula of this molecule and state its name.(b) Can you arrange these atoms to make a different molecule? If so, draw its structural formula and state its name.(c) How are the molecules drawn in (a) and (b) the same? How do they differ? What are they called (the type of relationship between these molecules, not their names)?

Use the periodic table to give the name and symbol for each of the following elements:

(a) the halogen in the same period as the alkali metal with 11 protons

(b) the alkaline earth metal in the same period with the neutral noble gas with 18 electrons

(c) the noble gas in the same row as an isotope with 30 neutrons and 25 protons

(d) the noble gas in the same period as gold

Use the build a molecule simulation (http://openstaxcollege.org/1/16molbuilding) to repeat Exercise 2.34, but build a molecule with three carbons, seven hydrogens, and one chlorine.

  1. Draw the structural formula of this molecule and state its name.
  2. Can u arrange these atoms to make a different molecule? If so, draw its structural formula and state its name.
  3. How are molecules drawn in (a) and (b) the same? How do they differs? What are they called (the type of relationship between these molecules, not their names)?

Explain why the symbol for an atom of the element oxygen and the formula for a molecule of oxygen differ.

See all solutions

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