PSA: I POSTED A QUESTION BEFORE THIS BUT IT GLITCHED AND IT DID NOT POST MY FULL QUESTION AND I WAS UNABLE TO EDIT IT WHICH GAVE ME THE WRONG ANSWER AND IT USED UP TWO OF MY QUESTIONS FOR THE MONTH SO IM POSTING THESE ALL AT ONCE. THANKS

1. Suppose SH₂ and O₂ react to produce H₂O, and a sulfur oxide which contains 66.71% sulfur by mass. Complete the reaction equation by entering the coefficients of the reactants and products and also the empirical formula of the sulfur oxide product

a) ?SH₂ + ?O₂ ---> ?H₂O + ???

2. Consider the following two-step reaction

2NaCL + 2H₂O ---> 2NaOH + H2 + Cl²

2Fe + 3Cl₂ ---> 2FeCl₃

Assuming that the chlorine generated in the first step is consumed in the second step, what mass of NaCl is needed in the first step to produce 55.7 g of FeCl₃ in the second step?

3. What mass of the second-listed reactant in each of the following reactions is needed to react completely with 1.359 g of the first listed reactant?

a) 4NH₃ + 3O₂ ---> 2N₂ +6H₂O

b) SiO₂ + 3C ---> 2CO + SiC

4. Sample of a substance (containing only C, H, and N) are burned in oxygen. 2.428 g of CO_2, 4.971 x 10^-1 of H₂O and 4.966 g of NO are the sole products of the combustions.

a) What is the empirical formula of the compound

b) What was the mass of the initial sample burned?

5. 1.849 g of a substance (containing only C, H, and O) are burned in a combustion analysis apparatus. The mass of CO₂ produced is 4.516 g and the mass of H₂O produced is 6.163 x 10^-1 g.

a) What is the empirical formula of the compound?

6. Calculate the percentage by weight of oxygen in the product formed when a 1.36 g sample of sulfur combines with oxygen to give 2.72 g of a pure compound

7. How many H₃PO₄ molecules are there in 1.96 moles of it

8. How many H₂SO₄ molecules are there in 5.37 moles of H₂SO₄