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Practice Exam 2a

# Practice Exam 2a - Practice Exam 2a 1 A student needs to...

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Practice Exam 2a 1. A student needs to prepare 2.00 L of 0.100 M Na 2 CO 3 (molar mass = 106 g/mol). The best procedure is to weigh out [A] 21.2 g Na 2 CO 3 and add 2.00 kg of H 2 O [B] 10.6 g Na 2 CO 3 and add 2.00 kg of H 2 O [C] 10.6 g Na 2 CO 3 and add H 2 O until the final homogeneous solution has a volume of 2.00 L. [D] 21.2 g Na 2 CO 3 and add 2.00 L of H 2 O [E] 21.2 g Na 2 CO 3 and add H 2 O until the final homogeneous solution has a volume of 2.00 L. 2. 183.3 mL of HBr solution reacted exactly with 62.1 mL of 0.0400 M Ca(OH) 2 solution. Calculate the molarity of the HBr solution. [A] 0.0487 M [B] 0.0136 M [C] 0.0542 M [D] 0.0271 M [E] 0.0379 M 3. Consider the following reaction: Cl 2 (g) + 2NaOH(aq) NaOCl(aq) + NaCl (aq) + H 2 O(l) How many grams of sodium hypochlorite can be produced from 25.0 g Cl 2 (g) and 500.0 mL of 2.00 M NaOH(aq)? [A] 13.1 g [B] 52.5 g [C] 26.2 g [D] 37.2 g [E] 20.0 g 4. Equal volumes of nitrogen (molar mass = 28 g/mol) and carbon monoxide (molar mass = 28 g/ mol) at the same temperature and pressure have the same 1. density. 2. number of molecules. 3. number of atoms. [A] 3 only [B] 2 only [C] 2 and 3 only [D] 1, 2, and 3 [E] 1 only 5. The valve between the 2.00-L bulb, in which the gas pressure is 1.00 atm, and the 3.00-L bulb, in which the gas pressure is 1.50 atm, is opened. What is the final pressure in the two bulbs, the temperature being constant and the same in both bulbs? 1

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 → [A] 0.900 atm [B] 1.25 atm [C] 1.30 atm [D] 2.25 atm [E] 2.50 atm 6. The volume of a sample of gas measured at 25.0 ° C and 1.00 atm pressure is 10.0 L. What must the final temperature be in order for the gas to have a final volume of 7.5 L at 1.00 atm pressure? [A]
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Practice Exam 2a - Practice Exam 2a 1 A student needs to...

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