chem1-solutions

chem1-solutions - Solutions 1 Solution a grams moles...

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Solutions 1 Solution: a. grams moles Formula Mass b. moles pV/RT c. p O 2 total pressure mole fraction oxygen 1.0atm .2 0.2 atm grams (1atm 0.2) 1. 76 L / 0.08206 atm L/mol K 32.0 g/mol 0.457 g 2 Solution: The consequences of the Pauli exclusion principle are that each orbital can hold at most 2 electrons and the electron spin must be in opposite directions. 3 Solution: Like dissolves like. CC 4 is nonpolar and will dissolve the nonpolar molecules C 4 H 10 and C 2 . Water is polar and will dissolve the polar molecule HC and the ionic molecule CaC 2 . 4 No solution provided. 5 Solution: First ionization energy is the energy needed to remove first electron from a neutral atom. Elements on the left hand side of periodic table have lower ionization energies than the one on the right hand side because they can easily loose electrons to form stable noble gas configurations. 6 Solution: H 2 ,O 2 ,andCH 4 are nonpolar and only have weak London dispersion forces. N 2 Ois polar and will have dipole-dipole forces. NH 3 is also polar but in addition exhibits hydrogen bonding forces which are surprisingly strong resulting in a relatively high melting temperature. 7 Solution: NO ON O O NO 2 has 18 valence electrons and has the two resonance structures shown. CO 2 ,NO 2 , SiO 2 all have 16 valence electrons and all 3 molecules have 2 double bonds as the best structure. OF 2 has 2 single bonds and two nonbonding pairs on the central atom. 8 Solution: 3. 12 grams C 3 H 12 O 6 180.18 g/mol 6 O atoms molecule 6. 02 10 23 atoms mole 6. 26 10 22 atoms 9 Solution: Br has 36 electrons and is isoelectronic with Kr. 10 Solution: Bases produce hydroxide ion (OH ). Of the given choices, RbOH, Ca(OH) 2 ,andNH 3 are the bases. Ca(OH) 2 Mg 2 2OH so it makes twice as many hydroxide ions as RbOH. NH 3 is a weak base and does not completely form hydroxide ions. (NH
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This note was uploaded on 11/21/2011 for the course CHEM CHEM 1201 taught by Professor Rupnik during the Spring '11 term at LSU.

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chem1-solutions - Solutions 1 Solution a grams moles...

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