4.50 L of ethane (C2H6) is burned in air at STP. _____C2H6 + _____O2 → _____CO2 + _____H2O (assume all are gases) After balancing the equation, calculate the Liters of O2 used in the reaction.

Answer 1

2C₂H₆ + 7O₂ ==> 4CO₂ + 6H₂O ... balanced equation

2 L ethane requires 7 L O₂ in the balanced equation.

Thus, 4.50 L ethane x 7 L O₂/2 L ethane = 15.75 L O₂