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The standard heat of combustion of Al is `-840kJ mol^(-1)` at `25^(@)C`. If Al reacts with `O_(2)` at `25^(@)C`, which of the following release 280kJ if heat?A. The reaction of `(1//1.6)` mol of AlB. The formation of `(1//1.6)` mol of `Al_(2)O_(3)`C. The reaction of `(1//3)` mol of AlD. The formation of `(1//6)` mol of `Al_(2)O_(3)` |
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Answer» Correct Answer - C::D `Al+(3)/(2)O_(2)rarr(1)/(2)Al_(2)O_(3)` `27g " " 51g` `DeltaH=-840kJmol^(-1)` `because 840kJrarr(1)/(2) mol Al_(2)O_(3)` `therefore 280kJ rarr (1)/(2)xx(280)/(840)=(1)/(6)"mol"Al_(2)O_(3)` |
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