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# Chemistry: Limiting Reagent and Enthalpy Sample Questions

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I am having trouble setting up the follow problems. I am not even sure where to start. If anyone can offer any advice, I would greatly appreciate it, as I am completely stumped:

1) The volume in Liters of H2(g), measured at 22 degrees C and 745 mmHg, required to react with 30.0 L of CO (g), measured at 0 degrees C and 760 mmHg, in the reaction 3CO(g)+7H2(g) --> C3H8(g)+3H2O(l) is?

2) The complete combustion of propane, C3H8(g), is represented by the equation C3H8(g)+5O2(g)-->3CO2(g)+4H2O(l). Delta H (change of enthalpy)=-2220 kJ.
How much heat is involved in the complete combustion of 12.5L C3H8(g) at 25 degrees C and 790 mmHg?

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https://brainmass.com/chemistry/energetics-and-thermodynamics/chemistry-limiting-reagent-enthalpy-sample-questions-438585

#### Solution Preview

The volume in Liters of H2(g), measured at 22 degrees C and 745 mmHg, required to react with 30.0 L of CO (g), measured at 0 degrees C and 760 mmHg, in the reaction 3CO(g)+7H2(g) --> C3H8(g)+3H2O(l) is?

First step is to determine the number of moles of H2(g) then you can determine the volume using the Ideal Gas Law.
3 CO2 (g) + 7 H2 (g) &#8594;yields C3H8 (g) ...

#### Solution Summary

The limiting reagent and enthalpy sample questions are examined in chemistry.

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