Chemistry Problem.

[The Godfather]

If 3.25 mol calcium carbide (CaC2) reacts with an excess of water, how many moles of acetylene (C2H2) will be produced?

CaC2(s) + 2 H2O(l) Ca(OH)2(aq) + C2H2(g)


Its supposed to be easy as hell but there are no examples in the book. Help me out.

 

[Brainonska511]

Easy. Normally, you'd use mol to mol ratios.

In this case, you can see that you have the same # of moles of carbon in acetylene as you do in calcium carbide. You also know you have excess water, making the calcium carbide the limiting reagent, therefore, the amount of mols of carbon in the calcium carbide will be the same in the acetylene.

 

[beemercer]

CaC2(s) + 2 H2O(l) ----> Ca(OH)2(aq) + C2H2(g)

1mol CaC2 produces 1 mol C2H2
so 3.25 mol CaC2 will produce 3.25 mol C2H2

 

[The Godfather]

tenks.