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PExamNew3A - Chemistry 101 Sample Exam#3 Note This exam has...

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Chemistry 101 Sample Exam #3 Note: This exam has more than 100 points; your exam will be 100 points, only. Multiple Choice. There is only one “best” answer for each of these multiple-choice questions. Please note, all answers must be given to the correct number of significant figures! (4 points each) 1. A 4.09 g sample of a pure substance has a volume of 5.98 mL. The volume of 50.0 grams of this substance is: a) 73.105 mL b) 7.3105 x10 2 mL *c) 73.1 cm 3 d) Insufficient information is provided to correctly calculate this answer. e) None of the above is correct . 2. When 13.99 grams of a substance burns, 24.06 grams of H 2 O are produced. When 1.2 × 10 3 grams of this same substance is burned, the amount of water produced will be: *a) 2.1 x 10 3 grams b) 2,063.7 grams c) 2,063.76 grams d) Insufficient information is provided to correctly calculate this answer. e) None of the above is correct . 3. A sample of drinking water contains 988 ppm (parts per million) As. In 82.0 grams of that same water: *a) The As concentration will be 988 ppm. b) There will be 988.0 grams of As. c) There will be 82.0 ppm of As. d) Insufficient information is provided to correctly calculate this answer. e) None of the above is correct . 4. A compound contains 24.96 % C, by mass. In 500.0 g of the compound there will be: 5. 125.0 μL is equivalent to: 6. 6.02 × 10 23 kilograms is equivalent to:
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7. Using the data given in the table above, the formula mass of methane, CH 4 , is: a) 16.0426 g/mol *b) 16.043 g/mol c) 13.0189 g/mol d) 13.019 g/mol e) None of the above is correct .
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