Question

PLEASE HELP!!!

Dinitrogen pentoxide is made by the following reaction:

4𝐻𝑁𝑂3 + 𝑃4𝑂10 → 2𝑁2𝑂5 + 4𝐻𝑃𝑂3 


If 15.1 g of P4O10 is heated with 10.7 g of HNO3, what is the percent yield if 1.96 g of N2O5 is obtained from the reaction?