Given a balanced chemical equation below: 3Cu (s) + 2H3PO4 - - - > Cu3 (PO4) 2 + 3H2 How many moles of copper are needed to react with 5 moles of phosphoric acid?

7.5 moles

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

3Cu + 2H3PO4 - > Cu3 (PO4) 2 + 3H2

From the balanced equation above,

3 moles of Cu reacted with 2 moles of H3PO4.

Therefore, Xmol of Cu will react with 5 moles of H3PO4 i. e

Xmol of Cu = (3 x 5) / 2

Xmol of Cu = 7.5 moles

Therefore, 7.5 moles of Cu are needed to react with 5 moles of H3PO4.