How can I get the mass of NaCl, g? How can I get the mas of SiO2,g?

Balance the following chemical equation. Note that a empty blank space will be interpreted as "1."   ___N2H4 (g) + ___N2O4 (g)  -->  ___N2 (g)  + ___H2O (g)

13. Suppose 90.0 g of Iron (III) chloride reacts with 17g of water? What is the limiting reagent? How much (in grams) will the products produce and how much of the excess reactant will remain after the reaction is complete?( Write the complete balanced reaction along with it states)

(0)       Mass of FeCl2 (g) Volume of KMnO4(mL) Molarity of KMnO4 Trial 1 1.9986 33.81 0.0185 Trial 2 2.0237 32.33 0.0185 Trial 3 2.002 33.58 0.0185 The molecular weight of FeCl2 is 151.91 g/mol.   In this assignment, you will determine the mass % of an unknown sample of ferrous chloride (FeCl2) by titrating it with a KMnO4 solution of known concentration. 11. What is the average % iron in the unknown sample using your best three answers?

8H2S + 4O2 = S8 + 8H2O: If 9 moles of H2S reacts with 4 moles of oxygen gas, O2, which of these two reactants will be left over when the reaction is complete?

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How many moles of NaOH do I have, if I have 16.05 mL of NaOH?

Part a) When FeS3 • 2H2O is heated, it gives off water, SO2 and Fe2O3. Is this a chemical or physical change? When CuSO4 • 5H2O is heated, it gives off water and CuSO4. Is this a chemical or physical change? Which of these changes can be easily reversed? Part b) Is the molar ratio of the products is different from the molar ratio in the hydrate formula, has a chemical or physical change taken place?