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Solution_to_Midterm_I_Spring_2006
Course: MASC 110L, Fall 2007School: USC
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of University Southern California MASC 110L Midterm I February 17, 2006 E. Goo Answer all questions. All questions are of equal value. 1. Draw the electron dot notation for the following molecules a) BF3 b) CO2 c) SiH4 d) SO42- e) NO3- 2. Naturally occurring rubidium(Rb) consists of two isotopes: Rb85(atomic mass 84.9117) and Rb87(atomic mass 86.9092). The atomic mass of the isotope mixture found in nature...
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of University Southern California MASC 110L Midterm I February 17, 2006 E. Goo
Answer all questions. All questions are of equal value. 1. Draw the electron dot notation for the following molecules a) BF3
b) CO2
c) SiH4
d) SO42-
e) NO3-
2. Naturally occurring rubidium(Rb) consists of two isotopes: Rb85(atomic mass 84.9117) and Rb87(atomic mass 86.9092). The atomic mass of the isotope mixture found in nature is 85.4678. the Calculate percent abundance of the two isotopes in rubidium.
3. Give the steric number of the central atom and determine the shape of the following molecules. Draw the molecule and give the name of the molecule shape. The first atom in the formula is the central atom. a) AsF3
b) XeF2
c) XeF4
d) CS2
e) SeF6
4. 5.86 grams of a gas at 100oC and one atmosphere of pressure has a volume to 5.6 liters. Identify the gas.
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