BC Extra Credit (CHM1040)
Name(Last, First)___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) 1.00 mole of O2 contains the same number of molecules as A) 2.00 mole of CH3CH2 OH. C) all of the above.

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B) 0.667 mole of O3 . D) 1.00 mole of CH3CO2H.

SHORT ANSWER. Work must be shown for each problem as much as you can. Final answer only is not excepted (no woks no points)

2) How many oxygen atoms are in 3.00 g of sodium dichromate, Na2 Cr2 O7 ?

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3) What mass of sulfur hexafluoride, SF6, has the same number of fluorine atoms as 25.0 g of oxygen difluoride, OF2?

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4) Combustion analysis of 2.400 g of an unknown compound containing carbon, hydrogen, and oxygen produced 4.171 g of CO2 and 2.268 g of H2O. What is the empirical formula of the compound?

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5) How many Cl- ions are present in 50.0 g FeCl3?

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6) 200 pm is the same as __________ Å.

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7) The empirical formula of a compound with molecules containing 12 carbon atoms, 14 hydrogen atoms, and 6 oxygen atoms is __________.

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8) The charge on the manganese in the salt MnF3 is __________.

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9) The ions Ca 2+ and PO43- form a salt with the formula __________.

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10) The unit of force in the English measurement system is
Newton, which is __________ in base SI units.

lb · ft . The SI unit of force is the s2

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11) 45 m/s = __________ km/hr

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12) The correct answer (reported to the proper number of significant figures) to the following is __________.
(12.67 + 19.2)(3.99) / (1.36 + 11.366) = _____

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13) In general, as you go across a period in the periodic table from left to right: (1) the atomic radius __________; (2) the electron affinity becomes __________ negative; and (3) the first ionization energy __________.

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