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The energy released by burning aluminium...

The energy released by burning aluminium is `807.5kJmol^(-1)`. How many atoms of the metal are to be burned to get 100kJ of energy released?

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Verified by Experts

The equation representing combustion of aluminium is
`AI+3O_(2)rarr2AI_(2)O_(3)`
807.5kJ of energy = 1 mole of AI
807.5 kJ energy `= 6.022xx10^(23)` AI atoms
100kJ energy = ?
The number of atoms AI to be burnt `= (100)/(807.5)xx6.022xx10^(23) = 7.46xx10^(22)`
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