How Much Heat is Released When Carbon Reacts with Oxygen?

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SUMMARY

The discussion centers on calculating the heat released when 4.72 grams of carbon reacts with excess oxygen, following the reaction C + O2 → CO2, which has a standard enthalpy change (ΔH) of -393.5 kJ. To determine the heat released, one must first calculate the number of moles of carbon in 4.72 grams. Given that the reaction releases 393.5 kJ per mole of carbon, the total heat released can be calculated based on the moles derived from the mass of carbon.

PREREQUISITES
  • Understanding of stoichiometry and mole calculations
  • Familiarity with chemical reaction equations
  • Knowledge of enthalpy changes in chemical reactions
  • Basic skills in unit conversions (grams to moles)
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  • Calculate the number of moles of carbon in 4.72 grams using the molar mass of carbon
  • Research the concept of limiting reagents in chemical reactions
  • Explore the principles of thermochemistry, specifically enthalpy changes
  • Learn about calorimetry and how to measure heat changes in reactions
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Chemistry students, educators, and anyone studying thermodynamics or chemical reactions, particularly those focusing on heat calculations in reactions.

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I am struggling with a recent chemistry lesson. Immediate help is needed and would be greatly appreciated. I know that we have to first find the limiting reagent, and then go on to determine the heat released in kiloJoules.

Homework Statement



How much heat will be released when 4.72 g of carbon reacts with excess O2 according to the following equation?

Homework Equations



C + O2 --> CO2 (Delta) H = -393.5 kJ

The Attempt at a Solution

 
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How many moles of C are there in 4.72g?
The equation says you get 393.5kJ for each mole.
 

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