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____ 122. These three species 80 Se, 81 Br and 82 Kr have<br />
a. the same atomic mass.<br />
b. the same number of protons.<br />
c. the same number of neutrons.<br />
d. the same mass number.<br />
e. the same number of electrons.<br />
____ 123. What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu<br />
(26.00%), and one with mass = 65.32 amu?<br />
a. 65.16 amu<br />
b. 64.37 amu<br />
c. 64.96 amu<br />
d. 65.04 amu<br />
e. 64.80 amu<br />
____ 124. Gallium has two naturally occurring isotopes. 69 Ga (68.9257 amu) is the more abundant isotope, at 60.4%. If<br />
the atomic mass of gallium is 69.723 amu, what is the mass of the other isotope, 71 Ga?<br />
a. 71 amu<br />
b. 71.512 amu<br />
c. 39.60 amu<br />
d. 69.985 amu<br />
e. 70.925 amu<br />
____ 125. The atomic weight of rubidium is 85.4678 amu. Rubidium consists of two isotopes, 85 Rb 72.15%) and 87 Rb<br />
(27.85%). The mass of an atom of 85 Rb is 84.9117 amu. What is the mass of an atom of 87 Rb?<br />
a. 86.7271 amu<br />
b. 86.8013 amu<br />
c. 86.8220 amu<br />
d. 86.8621 amu<br />
e. 86.9085 amu<br />
Ch. 5 Values<br />
Some of the following values may be useful for solving some of the following problems.<br />
speed of light = 3.00 10 8 m/s1 joule = 1 kg•m 2 /s 2<br />
Planck's constant = 6.63 10 -34 J•s1 Ångstrom = 1 10 -10 m<br />
____ 126. Refer to Ch. 5 Values. What is the frequency of light having a wavelength of 4.50 10 -6 cm?<br />
a. 2.84 10 -12 s -1<br />
b. 2.1 10 4 s -1<br />
c. 4.29 10 14 s -1<br />
d. 1.06 10 22 s -1<br />
e. 6.67 10 15 s -1<br />
____ 127. Refer to Ch. 5 Values. What is the wavelength of green light having a frequency of 6.10 10 14 Hz?<br />
a. 1.67 10 Å<br />
b. 1.07 10 17 Å<br />
c. 4.92 10 3 Å<br />
d. 2.38 10 -13 Å<br />
e. 6.61 10 -8 Å
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