Solution Set _2

Solution Set _2 - electrons in each. (a). 8 protons, 10...

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University of Southern California MASC 110L Problem Set #2 E. Goo Do the following problems from Brown and Holme. Answer to odd problems are in the back of book. 1. 2.12 Write the complete atomic symbol for each of the following isotopes. (a). carbon- 13 (b). phosphorus-31 (c). sodium-23 (d). boron-10 ANS a) 13 C, b) 31 P, c) 23 Na, d) 10 B 2. 2.18 The element gallium, used in gallium arsenide semiconductors, has an atomic mass of 69.72 amu. There are only two isotopes of gallium, 69 Ga with a mass of 68.9257 amu and 71 Ga with a mass of 70.9249 amu. What are the isotopic abundances of gallium? ANS 60.27% 69 Ga and 39.73% 71 Ga 3. 2.24 Provide the symbol of the following ions given the number of protons and
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Unformatted text preview: electrons in each. (a). 8 protons, 10 electrons ANS O 2- (b). 20 protons, 18 electrons ANS Ca 2+ (c). 53 protons, 54 electrons ANS I 1- (d). 26 protons, 24 electrons ANS Fe 2+ 4. 2.27 5. 2.51 6. 2.72 Write the molecular formula for each of the following covalent compounds. (a). silicon dioxide (b). tetraarsenic decaoxide (c). iodine heptafluoride (d). dinitrogen trioxide ANS a) SiO 2 , b) As 4 O 10 , c) IF 7 , d) N 2 O 3 7. 2.74 Name the following ionic compounds. (a). NaHCO 3 (b). Fe(OH) 2 (c). ZnS (d). Cr 2 O 3 ANS a) sodium hydrogen carbonate, b) iron (II) hydroxide , c) zinc sulfide, d) chromium (III) oxide 8. 2.91 9. 3.11 10. 3.15...
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Solution Set _2 - electrons in each. (a). 8 protons, 10...

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