Thermodynamics and Limiting Reactants

Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).

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Tyler Angtuaco 1G
Posts: 130
Joined: Wed Sep 11, 2019 12:16 am

Thermodynamics and Limiting Reactants

Postby Tyler Angtuaco 1G » Sun Mar 01, 2020 6:12 pm

Question 5.55 part b reads, "A sample of graphite of mass 5.20 kg and 125 g of water were placed into a 10.0-L container and heated to 900 K. What are the equilibrium concentrations?" (In part a, we found the equilibrium constant using the equation delta g naught = -RT*lnK). The solutions manual finds the limiting reactant based on the equation C(s) + H20(l) <-> CO2(g) + H2(g) before beginning an ICE table for part b. How come we never considered the possibility of a limiting reactant (or at least were required to find it) during our unit on equilibrium concentrations?

Harry Zhang 1B
Posts: 101
Joined: Sat Sep 14, 2019 12:16 am

Re: Thermodynamics and Limiting Reactants

Postby Harry Zhang 1B » Sun Mar 01, 2020 9:11 pm

If the problem does not specify whether the reaction happens in the excess of reactants, you should always consider the possibility of limiting reactants.

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