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To help get ready for the midterm

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Question
Answer
Balance the Following: FeS + O2 --> Fe2O3 + SO2   4FeS + 7O2(7 dioxide)--> 2Fe2O3+ 4SO2  
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Convert 8.76 x 10^12 ng to g.   8760 g  
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Convert 2.56 moles Ge to atoms.   1.54 x 10^24  
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Convert 8.90 x 10^15 molecules of CO2 to grams.   6.51 x 10^-7 grams  
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Balance the following: Cu + HNO3 --> Cu(NO3)2 + NO + H2O   3Cu + 8HNO3 --> 3 Cu(NO3)2 + 2NO + 4H20  
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Find the Empirical Formula. 26.56%K 35.41%Cr 38.03%C   KCrC5  
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4.04%N 11.46%O. Find the Empirical Formula and Molecular Formula if the formula mass is 108.0 amu.   Empirical Formula: N2O5 Molecular Formula: N2O5  
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Limiting Reagent: N2 + 3H2 --> 2NH3 How many grams of NH3 can be produced from the reaction of 28 g of N2 and 25 g of H2?   34g NH3  
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Limiting Reagent: 3AgNO3 + Na3PO4 -> Ag3PO4 + 3NaNO3 Silver nitrate and sodium phosphate are reacted in equal amounts of 200. g each. How many grams of silver phosphate are produced?   164G Ag3PO4  
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Percentage Yield: CO + 2H2 -> CH3OH If Co has 75.0 g and CH3OH produces 68.4 g, then find the percentage yield for CH3OH.   Percentage Yield = 79.7 %  
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Find the Empirical Formula: 25.3%Cu 12.9%S 25.7%O 36.1%H2O   CuSO4H10 xO5  
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