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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脳78.9183) +(0.4931脳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脳78.9183)+(0.4931脳80.9163)

Avg. atomic mass= (40.003+39.899) amu

= 79.90 amu

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Most popular questions from this chapter

Open theBuild an Atom simulation (http://openstaxcollege.org/l/16PhetAtomBld)and click on the

Atom icon.

a. Pick any one of the first 10 elements that you would like to build and state its symbol.

b. Drag protons, neutrons, and electrons onto the atom template to make an atom of your element.

State the numbers of protons, neutrons, and electrons in your atom, as well as the net charge and mass number.

c. Click on 鈥淣et Charge鈥� and 鈥淢ass Number,鈥� check your answers to (b), and correct, if needed.

d. Predict whether your atom will be stable or unstable. State your reasoning.

e. Check the 鈥淪table/Unstable鈥� box. Was your answer to (d) correct? If not, first predict what you can do to make a Stable atom of your element, and then do it and see if it works. Explain your reasoning.

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

Using the periodic table, identify the lightest member of each of the following groups:

(a) noble gases

(b) alkaline earth metals

(c) alkali metals

(d) chalcogens

Using the periodic table, identify the heaviest member of each of the following groups:

(a) Alkali metals

(b) Chalcogens

(c) Noble gases

(d) Alkaline earth metals

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

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