True or false, when a material loses thermal energy, it usually contracts.
2 answers:
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Answer : The amount of heat released in the combustion is, 209.5 kJ
Explanation :
First we have to calculate the moles of Al and .
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction will be:
From the balanced reaction we conclude that
As, 3 mole of react with 4 mole of
So, 0.188 moles of react with
moles of
From this we conclude that, is an excess reagent because the given moles are greater than the required moles and
is a limiting reagent and it limits the formation of product.
Now we have to calculate the moles of
From the reaction, we conclude that
As, 3 mole of react to give 2 mole of
So, 0.188 moles of react to give
moles of
Now we have to calculate the amount of heat released in the combustion.
As, 1 mole of releases amount of heat = 1676 kJ
So, 0.125 mole of releases amount of heat =
Thus, the amount of heat released in the combustion is, 209.5 kJ