RecitationSet2 - Determine the identity of the alkaline...

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Tufts University - Chem 1 - Summer 2008 Recitation Set 2 May 28 (Wed), 1 pm, Pearson 106 1 . Hydrocarbon X contains 83.63% C and 16.37% H. a) Determine its empirical formula. b) Determine its molecular formula if MW = 86. c) Name X. d) How many liters of oxygen gas (d = 1.30 g/L) are required for the full combustion of 1.00 g of X? 2 . Natural gallium has an average atomic mass of 69.72 amu and is composed of isotopes 69 Ga (M = 68.93 amu) and 71 Ga. The ratio of atoms 69 Ga/ 71 Ga in gallium is 1.5253. Calculate the atomic mass of gallium-71. 3 . Sulfide of an alkaline earth metal with a total mass of 1.000 g was reacted with excess oxygen gas and converted into the sulfate of the same metal with a total mass of 1.886 g.
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Unformatted text preview: Determine the identity of the alkaline earth metal. Prove your answer by calculations. Write the equation of the chemical reaction. 4 . A 2.05-g sample of iron-aluminum alloy is dissolved in excess HCl(aq) to produce 0.105 g of H 2 (g). What is the percent composition, by mass, of the alloy? Fe(s) + 2HCl(aq) → FeCl 2 (aq) + H 2 (g), 2Al + 6HCl(aq) → 2AlCl 3 (aq) + 3H 2 (g) 5 . The insecticide dieldrine contains carbon, hydrogen, oxygen and chlorine. Upon complete combustion, a 1.510-g sample yields 2.094 g CO 2 and 0.286 g H 2 O. The compound has a molecular mass of 381 amu and has as many chlorine atoms as carbon atoms. What is the molecular formula of dieldrine?...
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