Answer to Question #166495 in General Chemistry for Teeeeeeeeeera

Question

For the following reaction, 6.17 grams of diphosphorus pentoxide are mixed with excess water. The reaction yields 6.61 grams of phosphoric acid.

P2O5 (S) + 3H2O (I) ----> 2H3PO4 (aq)

(1) What is the theoretical yield of phosphoric acid? ..........grams

(2) What is the percent yield for this reaction? .........%

with steps please

Answer 1

1 mole of P₂O₅ gives 2 mole of H₃PO₄

( 6.17/283.8 ) = 0.217 moles of P₂O₅

theoretically 0.0434 moles of H₃PO₄ should be produced

theoretical yield = 0.00434×97.9 = 4.24g

But it is 6.61 g which is might due to error in meaning

So % theoretical yield is 100%