A reaction quotient equation using absolute concentrations rather than relative values is:

1. Equilibrium constants are strictly dimensionless quantities. 2. The reaction quotient equations as usually written are a simplification of more rigorous expressions. 3. Those rigorous expressions use relative values for concentrations and pressures rather than absolute values. 4. The simplification is standard at this level and gives the same numbers. 5. It is a convention, not a temperature-limited approximation. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 13 'Fundamental Equilibrium Concepts', sections 13.1-13.4_