Na2S2O3*5H2O is important to commercially to the photography?

Question

photography business because it has the ability to dissolve reactant unreacted silver salts from photographic film during development.
S8(s) + Na2So3(aq) + H2O(l)  Na2S2O3*5H2O(s) what is the theorectical yields of sodium thiosulfate pentahydrate when 3.25 g of sulfur is boiled with 13.1 g of sodium sulfite? What is the percent yield of the synthesis if a expirament is able to isolate only 5.26 g of the product.

Answer 1

The only thing that counts toward solving this problem is the reaction formula.

The formula that you have written down is not balanced. Replace S8 by S (or, if you prefer, by 1/8 S8; it is true that solid sulfur is made up of S8 molecules.)

Work out whether you have more moles of sulphur atoms, or of sodium sulphite. Then decide which is the limiting reagent.

Each mole of limiting reagent will give you one mole of product (in this particular reaction, which just happens to give 1:1:1 ratio of the two reactants and the product. Take care, because this will not always be true).

So you can work out how many moles of product, and what mass of product, you would have if you had 100% efficient reaction. This is called the theoretical yield

Percent yield = 100% x actual/theoretical