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Problem- How much heat (in kJ) is evolved (under standard conditions) when 83.84 g of copper reacts to form copper(II) oxide?

How much heat (in kJ) is evolved when 52.98 g of water cools and freezes from 70.64oC to 0oC?

How much heat (in kJ) is needed when 61.38 g of water warms and boils from 40.01oC to 100oC?

What is the change in enthalpy (in kJ) under standard conditions when 7.59 g of benzene is combusted?

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Category:- Chemistry
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