05 Covalent Compounds

05 Covalent Compounds - Question from Last Time Use unit...

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1 1 Question from Last Time Use unit analysis to decide which one of the following statements A - D is not correct. If more than one is not correct, respond E. A) To convert grams of a substance to moles, divide by the molar mass. B) To convert moles of a substance to the number of molecules multiply by Avogadro’s constant. C) To convert number of molecules of a substance to moles, divide by Avogadro’s constant. D) To convert moles of a substance to grams, divide by the molar mass. E) More than one is not correct. 2 Question from Today’s Reading 3.1 – 3.4 Which statement is not correct A) The composition of a compound is represented by a molecular formula that gives the elemental symbols with subscripts for the numbers of each atom needed to make one molecule. B) A structural formula shows how the atoms are connected together to make a molecule. C) Hydrocarbon compounds consist only of carbon and hydrogen. D) Binary compounds consist of bismuth plus other elements. E) Alkanes are a class of hydrocarbons.
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2 3 Comparison of the penny and atom calculations. 1808 g 2.509 penny 1 kg 1 g 1000 lbs 2.205 kg 1 lbs 10 N pns = pennies 24 24 - 10 087 . 3 amu 195.08 atom 1 g 10 1.6605 amu 1 kg 1 g 1000 kg 1 x x N Pt = atoms 4 Did you master how average atomic weights and molar masses are determined? (MSJ 2.6) Chlorine atoms consist of 2 stable isotopes, chlorine-35 and chlorine-37. Chlorine-35 has a mass of 34.969 amu with a natural abundance of 75.53%, and chlorine-37 has a mass of 36.966 amu with a natural abundance of 24.47%. What is the molar mass of a natural sample of chlorine?
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This note was uploaded on 10/16/2009 for the course CHE 129/130 taught by Professor Hanson during the Fall '09 term at SUNY Stony Brook.

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05 Covalent Compounds - Question from Last Time Use unit...

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