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1. Which of the following statements is incorrect? A. SF4 has ¼ as many sulfur atoms as fluorine atoms. B. Ca(NO3)2 has six times as many oxygen atoms as calcium ions. C. H2SO4 has twice as many oxygen atoms as hydrogen atoms. D. SO2 has twice as many oxygen atoms as sulfur atoms. E. N2H4 has four times as many hydrogen atoms as nitrogen atoms. 2. How many oxygen atoms are there in 0.25 mole of CO2? A. 4.2  10-25 B. 0.25 C. 3.0  1023 D. 0.50 E. 1.5  1023 3. Rank the following in order of increasing mass: 0.50 mole of water (H2O), 0.20 mole of Fe, and 0.010 mole of U. A. U < H2O>
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