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1 What is the mass of one mole of acetylsalicylic acid (aspirin), C9 H8 O4 ?A) 29 g B) 108 g C) 196 g D) 180 g E) none of the above 2 Determine the number of moles of aluminum in 2.154 x 10-1 kg of Al.A) 5816 mol B) 7.984 mol C) 6.02 x 1023 mol D) 4.801 mol E) 8.783 mol 3 What is the number of oxygen atoms in 55.0 g of iron(II) hydroxide (Fe(OH)2 (molar mass 89.85 g/mol))?A) 0.612 B) 1.22 C) 2.00 D) 3.69 x 1023 E) 7.37 x 1023 4 How many grams of zinc are there in 22.7 g of ZnCl2 ?A) 0.35 g B) 0.17 g C) 10.9 g D) 1476 g E) 0.32 g 5 A compound with a composition of 87.5 % N and 12.5 % H was recently discovered. What is the empirical formula for this compound?A) NH2 B) N2 H3 C) NH D) N2 H2 E) N2 H 6 Combustion analysis of a hydrocarbon produces 0.396 g of CO2 and 0.163 g of H2 O. Which of the following molecular formulas is consistent with the analysis?A) CH4 B) C2 H6 C) C2 H2 D) C2 H4 E) C3 H8 7 This equation is unbalanced: PCl3 + H2 O → H3 PO3 + HCl
When it is correctly balanced, the coefficients are, respectivelyA) 1,3,1,1 B) 1,1,1,3 C) 1,3,1,3 D) 2,3,2,3 E) none of the above 8 Balance the following equation with the smallest set of whole numbers.
C4 H10 + O2 → CO2 + H2 O
What is the coefficient for CO2 in the balanced equation?A) 1 B) 4 C) 6 D) 8 E) 12 9 The first step in the Ostwald process for making nitric acid is the formation of NO as follows: 4NH3 + 5O2 → 4NO + 6H2 O
According to the equation, 5 moles of NH3 will react stoichiometrically with ________ moles of O2 to form _______ moles of NO.A) 4, 5 B) 5, 4 C) 25, 20 D) 5/4, 4/5 E) 25/4, 5 10 Caustic soda, NaOH, can be prepared commercially by the reaction of Na2 CO3 with slaked lime, Ca(OH)2 . How many grams of NaOH can be obtained by treating 1.350 kg of Na2 CO3 with Ca(OH)2 ?A) 1788.8 g B) 1019 g C) 1.79 g D) 509.4 g E) 1.02 g 11 Given 6 mol of each reactant, which one would be limiting in the following reaction?
4Au + 8NaCN + O2 + 2H2 O → 4NaAu(CN)2 + 4NaOHA) Au B) NaCN C) O2 D) H2 O E) There is no limiting reactant. 12 In the direct reaction of silicon with Cl2 the yield of SiCl4 is 50. %. How many grams of silicon must be reacted with excess chlorine in order to obtain 17 g SiCl4 ?A) 1.4 g B) 2.8 g C) 5.6 g D) 17 g E) 28 g 13 What is the molarity of a solution that contains 3.00 moles of solute and 12.00 liters of solution?A) 0.25 M B) 3.00 M C) 4.00 M D) 12.00 M E) Not enough information is given to answer the question. 14 What volume of concentrated nitric acid (15.0 M ) is required to make 300 mL of a 2.5 M nitric acid solution?A) 1.8 L B) 50 mL C) 12.5 mL D) 18 mL E) 8 mL 15 Sodium phosphate (Na3 PO4 ) reacts with HCl to form H3 PO4 and NaCl. Use a balanced equation to determine how many liters of 0.1 M HCl are required to react with 0.1 mole of sodium phosphate.A) 0.03 L B) 0.3 L C) 0.6 L D) 1 L E) 3 L