In the reaction 2H2 + O2 --> 2H2O, how many moles of oxygen are required to fully react with 6.0 mol of hydrogen? A) 1.0 mol
B) 2.5 mol
C) 3.0 mol
D) 7.5 mol

Actually Welcome to the Concept of the Stochiometry.

Hence, here we can clearly see that, for 2 moles of Hydrogen, we need 1 mole of oxygen molecules,

so, then 6 moles of Hydrogen we need, 3 moles of Oxygen.

hence option c.) 3 mole

the answer is learned

hi my dude or dudette