You have 2344.44 grams of water (H20) that react according to this balanced chemical reaction. What is the theoretical yield of H3PO4 ?
P4010 + 6H2O --> 4H3PO4

8596.5 g H₃PO₄

Explanation:

First we convert the given mass of water to moles, using its molar mass:

Now we convert H₂O moles into H₃PO₄ moles, using the stoichiometric coefficients:

Finally we convert H₃PO₄ moles into grams, using its molar mass:

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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