Heating zinc sulfide in the presence of oxygen yields the following:
ZnS + O2 (arrow) ZnO + SO2
If 1.72 mol of ZnS is heated in the presence of 3.04 mol of O2, which reactant will be used up? Balance the equation first.© BrainMass Inc. brainmass.com September 21, 2018, 1:38 pm ad1c9bdddf - https://brainmass.com/chemistry/stoichiometry/stoichiometry-heating-zinc-sulfide-55780
ZnS + O2 -----> ZnO + SO2
First we need to balance it.
Check Zn. They're balanced already.
Check S. They're balanced already.
Check O. There are 2 O on the left and 3 O on the right.
Therefore, we need to add 1 more O on the left. That would be 1/2 of O2 more. Since there is an understood "1" in front of each of the chemicals, we write 3/2 in ...
This solution contains step-by-step reaction mechanisms to determine which reactant will be used up.