Chemistry: The Molecular Nature of Matter and Change (Silberberg), 7th Edition

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1			What is the mass of one mole of acetylsalicylic acid (aspirin), C9H8O4?
			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)	N2H3
			C)	NH
			D)	N2H2
			E)	N2H
6			Combustion analysis of a hydrocarbon produces 0.396 g of CO2 and 0.163 g of H2O. Which of the following molecular formulas is consistent with the analysis?
			A)	CH4
			B)	C2H6
			C)	C2H2
			D)	C2H4
			E)	C3H8
7			This equation is unbalanced: PCl3 + H2O → H3PO3 + HCl When it is correctly balanced, the coefficients are, respectively
			A)	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. C4H10 + O2 → CO2 + H2O 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 + 6H2O 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 Na2CO3 with slaked lime, Ca(OH)2. How many grams of NaOH can be obtained by treating 1.350 kg of Na2CO3 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 + 2H2O → 4NaAu(CN)2 + 4NaOH
			A)	Au
			B)	NaCN
			C)	O2
			D)	H2O
			E)	There is no limiting reactant.