Question

How many moles of water are consumed if 0.729 mol H3PO4 are produced?

Answer 1

1) State the equation that represents the chemical reaction
P2O5 + 3H2O → 2H3PO4
2) State the molar ratios: 1 mol P2O5 : 3 mol H2O : 2 mol H3PO4
3) Use the proportions 3molH2O / 2 mol H3PO4
0.729 mol H3PO4 * [ 3 mol H2O / 2 mol H3PO4] = 1.094 mol H2O
Answer: 1.094 mol of water

Answer 2

The number of mole of water, H₂O consumed by the reaction is 1.094 mole.

P₂O₅ + 3H₂O —> 2H₃PO₄

From the balanced equation above,

2 moles of H₃PO₄ were produced by 3 moles of H₂O.

With the above information, we can obtain the number of mole of H₂O needed to produce 0.729 moles of H₃PO₄.

From the balanced equation above,

2 moles of H₃PO₄ were produced by 3 moles of H₂O.

Therefore,

0.729 moles of H₃PO₄ will be produce by = (0.729 × 3) / 2 = 1.094 mole of H₂O.

Thus, 1.094 mole of H₂O is needed for the reaction.

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