How many moles of copper are needed to react with sulfur to produce 0.25 moles of copper (I) sulfide according to the following reaction:

2 Cu + S à Cu2S

0.5 mole

Explanation:

The equation for the reaction is given below:

2Cu + S - > Cu2S

We can calculate the mole of copper (Cu) needed to react with sulphur (S) to produce 0.25 mole of copper (I) sulfide (Cu2S) by doing the following:

From the balanced equation above,

2 moles of Cu reacted to produced 1 mole of Cu2S.

Therefore, Xmol of Cu will react to produce 0.25 mole of Cu2S i. e

Xmol of Cu = 2 x 0.25 = 0.5 mole

Therefore, 0.5 mole of copper (Cu) will react with sulphur (S) to produce 0.25 mole of copper (i) sulfide (Cu2S)