allthebest Posted May 18, 2016 Report Share Posted May 18, 2016 20 cm3 of ethyne, C2H2 are reacted with 500cm3 of oxygen. The equation for the reaction is 2C2H2 (g) + 5O2 (g) --> 4CO2 (g) + 2H2O (l) what is the limiting reactant? My answer is C2H2 with 0.000417 mol Is this correct? Reply Link to post Share on other sites More sharing options...
Msj Chem Posted May 18, 2016 Report Share Posted May 18, 2016 (edited) C2H2 to O2 is a 2:5 ratio Therefore 20cm3 of C2H2 reacts with 50cm3 of O2. According to the question, you have 500cm3 of O2, so that makes C2H2 the limiting reactant. The O2 is the excess reactant (there will be 450cm3 of O2 remaining). By the way, there is no need to convert to moles because all the reactants are in the gaseous state. Maybe this video will help: Edited May 19, 2016 by Msj Chem 1 Reply Link to post Share on other sites More sharing options...
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