At a certain temperature and pressure, 1.50 L of NO(g) is mixed with 1.00 L of O₂(g) and the gases react completely to form NO₂(g) according to the equation
2 NO + O₂ → 2 NO₂
Assuming temperature and pressure remain constant, what is the total volume of gas present after the reaction is complete?
a) 1.67 L
b) 1.50 L
c) 1.75 L
d) 2.50 L