A #10*g# mass of aluminum reacts with a #19*g# mass of oxygen gas. Which is the reagent in deficiency?

1 Answer
Nov 8, 2015

Answer:

#2Al + 3/2O_2 rarr Al_2O_3#

Explanation:

You have done the hard part, the balanced chemical equation, the which is absolutely necessary for these sorts of reactions.

Moles of aluminum, #(10*g)/(26.98*g*mol^(-1)#; versus moles of dioxygen, #(19*g)/(32.00*g*mol^(-1)#. Given a calculator it should be easy to see the reagent in deficiency. Remember you have to account for the reaction's stoichiometry: 4 moles of aluminum require 3 moles of oxygen for reaction.