Consider the reaction, x + 2y → xy2 if x and y are completely consumed in the reaction and we start with 10.0 mol of y, then how many total moles of x and y will be in the reaction?

In the reaction you would have 15.0 mols of Y and X.

Explanation:

The stoichiometric coefficents for X and Y are 1 and 2 respectively, if you start the reaction with 10.0 moles of Y you would need 5.0 moles of X in order to achieve a complete reaction so you will have 15.0 total moles in the reaction, assuming no mass loss and no nuclear reactions.

the answer is b i think

pretty sure it's false