Chem 1 exam 2 - Chemistry 1450 Exam 2 Spring 2008 Name...

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Chemistry 1450; Exam 2 Spring 2008 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients? ________ C H 4 O ( l ) + ________ O 2 ( g ) • ________ CO 2 ( g ) + ________ H 2 O( l ) A) 3 B) 9 C) 7 D) 5 1) 2) What is the mass of 0.500 mol of carbon tetrachloride, CCl 4 ? A) 308 g B) 154 g C) 76.9 g D) 3.25 × 10 -3 g 2) 3) Which of the following has the smallest mass? A) 3.50 × 10 23 molecules of I 2 B) 2.50 mol of F 2 C) 85.0 g of Cl 2 D) 0.050 kg of Br 2 3) 4) How many chloride ions are there in 3.00 mol of aluminum chloride? A) 3.00 chloride ions B) 5.42 × 10 24 chloride ions C) 1.81 × 10 24 chloride ions D) 9.00 chloride ions 4) 5) How many moles of BCl 3 are needed to produce 25.0 g of HCl( aq ) in the following reaction? BCl 3 ( g ) + 3 H 2 O( l ) • 3 HCl(aq) + B(OH) 3 ( aq ) A) 0.686 mol B) 4.38 mol C) 2.06 mol D) 0.229 mol 5) 6) How many grams of calcium chloride are needed to produce 2.50 g of potassium chloride? CaCl 2 ( aq ) + K 2 CO 3 ( aq ) • 2 KCl( aq ) + CaCO 3 ( aq ) A) 1.86 g B) 3.72 g C) 0.537 g D) 7.44 g 6) 7) Balance the chemical equation given below, and determine the number of grams of MgO are needed to produce 20.0 g of Fe 2 O 3 . ________ MgO( s ) + ________ Fe( s ) • ________ Fe 2 O 3 ( s ) + ________ Mg( s ) A) 5.05 g B) 15.1 g C) 1.68 g D) 0.0660 g 7) 8) When 10.0 g of calcium metal isreacted with water, 5.00 g of calcium hydroxide is produced. Using the following balanced equation, calculate the percent yield for the reaction? Ca(
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Chem 1 exam 2 - Chemistry 1450 Exam 2 Spring 2008 Name...

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