Thermochemical Equation Determine Mass

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In summary, a thermochemical equation is a balanced chemical equation that includes the enthalpy change (ΔH) for the reaction. The mass in a thermochemical equation is determined by using the molar mass of each element or compound involved in the reaction, and this allows us to calculate the amount of heat energy involved in the reaction and understand the stoichiometry and limiting reactant. To balance the equation, the coefficients must be adjusted to ensure the same number of atoms on both sides. The enthalpy change indicates whether the reaction is exothermic or endothermic and helps determine the heat of formation for compounds, which is important in understanding their stability.
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disneychannel
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So I am doing practice problems from the textbook and it states:

Given the thermochemical equation: 2Cu2O(s) → 4Cu(s) + O2, ΔH =+333.8 kJ/mol, calculate the mass of copper produced when 1.47 x 104 kJ is consumed in this reaction

My attempt

(1.47 x 104 kJ)/(33.8 kJ/mol )= 44 mol x 2 2 60=5.284 kg
BUT This is wrong and I don't know why...the answer is 11.2 kg
 
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  • #2
No idea what you did, what is "2 2 60"?

It is 333.8 kJ per "mole of reaction", not "mole of copper".
 

FAQ: Thermochemical Equation Determine Mass

What is a thermochemical equation?

A thermochemical equation is a balanced chemical equation that includes the enthalpy change (ΔH) for the reaction. This indicates the amount of heat energy that is either absorbed or released during the reaction.

How is mass determined in a thermochemical equation?

The mass is determined by using the molar mass of each element or compound involved in the reaction. This can be found by multiplying the number of moles of each substance by its molar mass.

What is the purpose of determining mass in a thermochemical equation?

Determining mass in a thermochemical equation allows us to calculate the amount of heat energy involved in a chemical reaction. It also helps us understand the stoichiometry of the reaction and determine the limiting reactant.

How do you balance a thermochemical equation?

To balance a thermochemical equation, you must ensure that the number of atoms of each element is the same on both sides of the equation. This can be done by adjusting the coefficients in front of each reactant and product.

What is the significance of the enthalpy change in a thermochemical equation?

The enthalpy change in a thermochemical equation tells us whether a reaction is exothermic (releasing heat energy) or endothermic (absorbing heat energy). It also helps us determine the heat of formation for a compound, which is important in understanding the stability of substances.

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