CHE102MF09S

# CHE102MF09S - 1.Your 2009 Ferrari F430 averages 17 L/100 km...

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1.Your 2009 Ferrari F430 averages 17 L/100 km of gasoline and you drive an average of 12,000 miles/year. What is your carbon footprint in lbs CO 2 /year from driving your Ferrari assuming that the average composition of gasoline can be represented by C 8 H 18 and the density of gasoline is 7.29 lb/US gallon gasoline? Assume that all of the carbon contained in the gasoline is converted to CO 2 . 2,672 B) 6,309 C) 19,482 D) 1,146 E) 8,855 2. A 0.755 g sample of hydrated copper(II) sulfate (CuSO 4 x H 2 O) was heated carefully until it had changed completely to anhydrous copper(II) sulfate (CuSO 4 ) with a mass of 0.483 g. Determine the value of x . (This number is called “the number of waters of hydration” of copper(II) sulfate. It specifies the number of water molecules per formula unit of CuSO 4 in the hydrated crystal.) A) 1 B) 2 C) 3 D) 4 E) 5 Solution g 0.272 g 0.883 g 0.755 2 O H m mol 10 1.51 g/mol 18 g 272 . 0 2 2 O H n mol 10 3.03 g/mol 62 . 59 1 g 483 . 0 3 4 CuSO n 5 99 . 4 mol 10 3.03 mol 10 1.51 3 2 x CuSO 4 ∙5H 2 O 3.Hydrochloric acid can be prepared by the following reaction: 2NaCl(s) + H 2 SO 4 (aq) 2HCl(g) + Na 2 SO 4 (s) How many grams of HCl can be prepared from 2.00 mol H 2 SO 4 and 150 g NaCl? A) 7.30g B) 93.5g C) 146g D) 150g E) 196g Solution: NaCl=23+35.5=58.5g/mol; H 2 SO 4 + 2(1)+32.1+4(16)= 98.1 g/mol Therefore No of moles of NaCl in 150g = 150/58.5 = 2.564 mols; No of moles of H 2 SO 4 = 2 mols From stiochiometry, 1 mol of H 2 SO 4 reacts with 2 mols of NaCl; hence for 2 mols of H

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CHE102MF09S - 1.Your 2009 Ferrari F430 averages 17 L/100 km...

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