We can simply do a rate-to-rate comparison based on the stoichiometric coefficients.
Reaction: 2 H2(g) + O2(g) → 2 H2O(g)
For O2(g): Since O2 is a reactant, the rate should be negative since reactants are consumed/decreased.
The rate with respect to O2 is:
Consider the combustion of H2(g): 2 H2(g) + O2(g) → 2 H2O(g). If hydrogen is burning at the rate of 0.50 mol/s, what is the rate of consumption of oxygen?
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