PLEASE HELP. Consider the following reaction: P2O5(s)+3H2O(l)2H3PO4(aq) a. Write the expression for Kc for the reaction. For this I got: Kc=[H3PO4]^2/[P2O5]*[H2O]^3 b. If the value of Kc is 13.27 calculate the concentration of H3PO4 that will be present at equilibrium. I have no idea how to do b... I think I need at least an initial concentration or a concentration at equilibrium but the problem does not give any. Is there any way to solve this??? Thanks.

Question

PLEASE HELP. 
Consider the following reaction: P2O5(s)+3H2O(l)<--->2H3PO4(aq)
a. Write the expression for Kc for the reaction. 
For this I got: Kc=[H3PO4]^2/[P2O5]*[H2O]^3
b. If the value of Kc is 13.27 calculate the concentration of H3PO4 that will be present at equilibrium.
I have no idea how to do b... I think I need at least an initial concentration or a concentration at equilibrium but the problem does not give any. Is there any way to solve this??? Thanks.

anonymous · Answer

liquid and solids dont have concentrations

anonymous · Answer

hence the Kc is as good as the concentration of the aqueous solution of H3PO4

anonymous · Answer

Soo... the concentration of H3PO4 is sqrt(13.27)?