i need help with 5 questions about chemistry

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1- When iron and steam react at high temperatures, the following reaction takes place: 3 Fe(s) + 4 H2O(g)  Fe3O4(s) + 4 H2(g)
How much iron must react with excess steam to form 897 g of Fe3O4 if the reaction yield is 69%?

2- Sulfur hexafluoride is a very stable gas useful in electrical generators and switches. It is formed by direct synthesis from the elements.
S(s) + 3 F2(g)  SF6(g)
If 92 g of SF6 is produced from the reaction of 115 g of sulfur in excess fluorine, what is the percentage yield?

3- A mixture of 10.0 g of NO and 14.0 g of NO2 results in the production of 8.52 g of N2O3. What is the percentage yield?
NO(g) + NO2(g)  N2O3()

4- A metallurgical firm needs to dispose of 2.74  103 gallons of waste sulfuric acid whose concentration has been determined to be 1.53 M.
Environmental regulations require them to neutralize the waste before releasing the waste water, and they choose to do so with slaked lime, Ca(OH)2(s).
The neutralization reaction is:
H2SO4(aq) + Ca(OH)2(s)  CaSO4(s) + 2 H2O()

If the slaked lime costs $0.52 per pound, how much will it cost to neutralize the waste sulfuric acid?

5- Elemental analysis is sometimes carried out by combustion of the sample. For a hydrocarbon, the only products formed are CO2 and H2O.
If a 1.36-g sample of an unknown hydrocarbon is burned and 2.21 g of H2O are produced along with 4.07 g of CO2, what is the empirical formula of the hydrocarbon?

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